/************************************************************************************//** * \file Source/_template/flash.c * \brief Bootloader flash driver source file. * \ingroup Target__template_flash * \internal *---------------------------------------------------------------------------------------- * C O P Y R I G H T *---------------------------------------------------------------------------------------- * Copyright (c) 2019 by Feaser http://www.feaser.com All rights reserved * *---------------------------------------------------------------------------------------- * L I C E N S E *---------------------------------------------------------------------------------------- * This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or * modify it under the terms of the GNU General Public License as published by the Free * Software Foundation, either version 3 of the License, or (at your option) any later * version. * * OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR * PURPOSE. See the GNU General Public License for more details. * * You have received a copy of the GNU General Public License along with OpenBLT. It * should be located in ".\Doc\license.html". If not, contact Feaser to obtain a copy. * * \endinternal ****************************************************************************************/ /************************************************************************************//** * \defgroup Target__template_flash Flash driver of a port * \brief This module implements the flash EEPROM memory driver of a microcontroller * port. * \details The flash driver manages the actual erase and program operations on the * flash EEPROM and the signature checksum. * The signature checksum is a 32-bit value in the user program. It is used as * a flag to determine if a user program is present or not. * Newly programmed data is always first buffered in RAM buffers with a size * of FLASH_WRITE_BLOCK_SIZE. * This driver manages a second RAM buffer of the same size, called the * bootBlock. The bootBlock buffers program data that includes the interrupt * vector table and the 32-bit signature checksum. The signature checksum * value is written as the last step during a firmware update, hence the need * for the bootBlock. * Note that the majority of this flash driver can be used as is. The only * parts that need to be updated / implemented are: * * Macros FLASH_WRITE_BLOCK_SIZE and BOOT_FLASH_VECTOR_TABLE_CS_OFFSET. * * The flashLayout[]-array contents. * * The functions FlashEraseSectors() and FlashWriteBlock(). * * The functions FlashWriteChecksum() and FlashVerifyChecksum(). * \ingroup Target__template ****************************************************************************************/ /**************************************************************************************** * Include files ****************************************************************************************/ #include "boot.h" /* bootloader generic header */ /**************************************************************************************** * Macro definitions ****************************************************************************************/ /** \brief Value for an invalid sector entry index into flashLayout[]. */ #define FLASH_INVALID_SECTOR_IDX (0xff) /** \brief Value for an invalid flash address. */ #define FLASH_INVALID_ADDRESS (0xffffffff) /** \brief Standard size of a flash block for writing. */ /* TODO ##Port The FLASH_WRITE_BLOCK_SIZE should be at least 512. If for some reason this * is not large enough, double the size so: 512 -> 1024 -> 2048 -> 4096 etc. */ #define FLASH_WRITE_BLOCK_SIZE (512) /** \brief Total numbers of sectors in array flashLayout[]. */ #define FLASH_TOTAL_SECTORS (sizeof(flashLayout)/sizeof(flashLayout[0])) /** \brief End address of the bootloader programmable flash. */ #define FLASH_END_ADDRESS (flashLayout[FLASH_TOTAL_SECTORS-1].sector_start + \ flashLayout[FLASH_TOTAL_SECTORS-1].sector_size - 1) /** \brief Offset into the user program's vector table where the checksum is located. * For this target it is set to the end of the vector table. Note that the * value can be overriden in blt_conf.h, because the size of the vector table * could vary. When changing this value, don't forget to update the location * of the checksum in the user program accordingly. Otherwise the checksum * verification will always fail. */ #ifndef BOOT_FLASH_VECTOR_TABLE_CS_OFFSET /* TODO ##Port The bootloader uses a 32-bit checksum signature value to determine if a * a valid user program is present or not. This checksum value is written by the * bootloader at the end of a firmware update with function FlashWriteChecksum(). Right * before a user program is about to be started, function FlashVerifyChecksum() is called * to verify the presence of a user program. Space must be reserved in the user program * for the checksum signature value and the bootloader needs to know where this space * is reserved. It is recommended to place the signature checksum right after the * user program's vector table. Using this approach it is easy to reserved space for the * checksum signature in the user program by simply adding one more dummy entry into the * vector table. This macro should be set to the size of the vector table, which can then * be used to determine the memory address of the signature checksum. */ #define BOOT_FLASH_VECTOR_TABLE_CS_OFFSET (0x188) #endif /**************************************************************************************** * Plausibility checks ****************************************************************************************/ #if (BOOT_FLASH_VECTOR_TABLE_CS_OFFSET >= FLASH_WRITE_BLOCK_SIZE) #error "BOOT_FLASH_VECTOR_TABLE_CS_OFFSET is set too high. It must be located in the first writable block." #endif #ifndef BOOT_FLASH_CUSTOM_LAYOUT_ENABLE #define BOOT_FLASH_CUSTOM_LAYOUT_ENABLE (0u) #endif /**************************************************************************************** * Type definitions ****************************************************************************************/ /** \brief Flash sector descriptor type. */ typedef struct { blt_addr sector_start; /**< sector start address */ blt_int32u sector_size; /**< sector size in bytes */ blt_int8u sector_num; /**< sector number */ } tFlashSector; /** \brief Structure type for grouping flash block information. * \details Programming is done per block of max FLASH_WRITE_BLOCK_SIZE. for this a * flash block manager is implemented in this driver. this flash block manager * depends on this flash block info structure. It holds the base address of * the flash block and the data that should be programmed into the flash * block. The .base_addr must be a multiple of FLASH_WRITE_BLOCK_SIZE. */ typedef struct { blt_addr base_addr; blt_int8u data[FLASH_WRITE_BLOCK_SIZE]; } tFlashBlockInfo; /**************************************************************************************** * Hook functions ****************************************************************************************/ #if (BOOT_FLASH_CRYPTO_HOOKS_ENABLE > 0) extern blt_bool FlashCryptoDecryptDataHook(blt_int8u * data, blt_int32u size); #endif /**************************************************************************************** * Function prototypes ****************************************************************************************/ static blt_bool FlashInitBlock(tFlashBlockInfo *block, blt_addr address); static tFlashBlockInfo *FlashSwitchBlock(tFlashBlockInfo *block, blt_addr base_addr); static blt_bool FlashAddToBlock(tFlashBlockInfo *block, blt_addr address, blt_int8u *data, blt_int32u len); static blt_bool FlashWriteBlock(tFlashBlockInfo *block); static blt_bool FlashEraseSectors(blt_int8u first_sector_idx, blt_int8u last_sector_idx); static blt_int8u FlashGetSectorIdx(blt_addr address); /**************************************************************************************** * Local constant declarations ****************************************************************************************/ /** \brief If desired, it is possible to set BOOT_FLASH_CUSTOM_LAYOUT_ENABLE to > 0 * in blt_conf.h and then implement your own version of the flashLayout[] table * in a source-file with the name flash_layout.c. This way you customize the * flash memory size reserved for the bootloader, without having to modify * the flashLayout[] table in this file directly. This file will then include * flash_layout.c so there is no need to compile it additionally with your * project. */ #if (BOOT_FLASH_CUSTOM_LAYOUT_ENABLE == 0) /** \brief Array wit the layout of the flash memory. * \details Also controls what part of the flash memory is reserved for the bootloader. * If the bootloader size changes, the reserved sectors for the bootloader * might need adjustment to make sure the bootloader doesn't get overwritten. */ static const tFlashSector flashLayout[] = { /* TODO ##Port Update the contents of this array with the erase sector sizes as defined * in the microcontroller's reference manual. The flash sector erase sizes are * hardware specific and must therefore match, otherwise erase operations cannot be * performed properly. * Besides controlling the flash erase size, this array also controls which sectors * are reserved for the bootloader and will therefore never be erased. The current * fictive implementation is for a microcontroller that can only erase flash memory * in chunks of 16 KB and the first 32 KB are reserved for the bootloader. Its flash * memory starts at 0x08000000 in the memory map. */ /* { 0x08000000, 0x04000, 0}, flash sector 0 - reserved for bootloader */ /* { 0x08004000, 0x04000, 1}, flash sector 1 - reserved for bootloader */ { 0x08008000, 0x04000, 2}, /* flash sector 2 - 16kb */ { 0x0800C000, 0x04000, 3}, /* flash sector 3 - 16kb */ #if (BOOT_NVM_SIZE_KB > 64) { 0x08010000, 0x4000, 4}, /* flash sector 4 - 16kb */ { 0x08014000, 0x4000, 5}, /* flash sector 5 - 16kb */ { 0x08018000, 0x4000, 6}, /* flash sector 6 - 16kb */ { 0x0801C000, 0x4000, 7}, /* flash sector 7 - 16kb */ #endif #if (BOOT_NVM_SIZE_KB > 128) { 0x08020000, 0x4000, 8}, /* flash sector 8 - 16kb */ { 0x08024000, 0x4000, 9}, /* flash sector 9 - 16kb */ { 0x08028000, 0x4000, 10}, /* flash sector 10 - 16kb */ { 0x0802C000, 0x4000, 11}, /* flash sector 11 - 16kb */ { 0x08030000, 0x4000, 12}, /* flash sector 12 - 16kb */ { 0x08034000, 0x4000, 13}, /* flash sector 13 - 16kb */ { 0x08038000, 0x4000, 14}, /* flash sector 14 - 16kb */ { 0x0803C000, 0x4000, 15}, /* flash sector 15 - 16kb */ #endif #if (BOOT_NVM_SIZE_KB > 256) #error "BOOT_NVM_SIZE_KB > 256 is currently not supported." #endif }; #else #include "flash_layout.c" #endif /* BOOT_FLASH_CUSTOM_LAYOUT_ENABLE == 0 */ /**************************************************************************************** * Local data declarations ****************************************************************************************/ /** \brief Local variable with information about the flash block that is currently * being operated on. * \details The smallest amount of flash that can be programmed is * FLASH_WRITE_BLOCK_SIZE. A flash block manager is implemented in this driver * and stores info in this variable. Whenever new data should be flashed, it * is first added to a RAM buffer, which is part of this variable. Whenever * the RAM buffer, which has the size of a flash block, is full or data needs * to be written to a different block, the contents of the RAM buffer are * programmed to flash. The flash block manager requires some software * overhead, yet results is faster flash programming because data is first * harvested, ideally until there is enough to program an entire flash block, * before the flash device is actually operated on. */ static tFlashBlockInfo blockInfo; /** \brief Local variable with information about the flash boot block. * \details The first block of the user program holds the vector table, which on the * STM32 is also the where the checksum is written to. Is it likely that * the vector table is first flashed and then, at the end of the programming * sequence, the checksum. This means that this flash block need to be written * to twice. Normally this is not a problem with flash memory, as long as you * write the same values to those bytes that are not supposed to be changed * and the locations where you do write to are still in the erased 0xFF state. * Unfortunately, writing twice to flash this way, does not work reliably on * all micros. This is why we need to have an extra block, the bootblock, * placed under the management of the block manager. This way is it possible * to implement functionality so that the bootblock is only written to once * at the end of the programming sequence. */ static tFlashBlockInfo bootBlockInfo; /************************************************************************************//** ** \brief Initializes the flash driver. ** \return none. ** ****************************************************************************************/ void FlashInit(void) { /* init the flash block info structs by setting the address to an invalid address */ blockInfo.base_addr = FLASH_INVALID_ADDRESS; bootBlockInfo.base_addr = FLASH_INVALID_ADDRESS; } /*** end of FlashInit ***/ /************************************************************************************//** ** \brief Reinitializes the flash driver. ** \return none. ** ****************************************************************************************/ void FlashReinit(void) { /* init the flash block info structs by setting the address to an invalid address */ blockInfo.base_addr = FLASH_INVALID_ADDRESS; bootBlockInfo.base_addr = FLASH_INVALID_ADDRESS; } /*** end of FlashReinit ***/ /************************************************************************************//** ** \brief Writes the data to flash through a flash block manager. Note that this ** function also checks that no data is programmed outside the flash ** memory region, so the bootloader can never be overwritten. ** \param addr Start address. ** \param len Length in bytes. ** \param data Pointer to the data buffer. ** \return BLT_TRUE if successful, BLT_FALSE otherwise. ** ****************************************************************************************/ blt_bool FlashWrite(blt_addr addr, blt_int32u len, blt_int8u *data) { blt_bool result = BLT_TRUE; blt_addr base_addr; /* validate the len parameter */ if ((len - 1) > (FLASH_END_ADDRESS - addr)) { result = BLT_FALSE; } /* only continue if all is okay so far */ if (result == BLT_TRUE) { /* make sure the addresses are within the flash device */ if ((FlashGetSectorIdx(addr) == FLASH_INVALID_SECTOR_IDX) || \ (FlashGetSectorIdx(addr+len-1) == FLASH_INVALID_SECTOR_IDX)) { result = BLT_FALSE; } } /* only continue if all is okay so far */ if (result == BLT_TRUE) { /* if this is the bootblock, then let the boot block manager handle it */ base_addr = (addr/FLASH_WRITE_BLOCK_SIZE)*FLASH_WRITE_BLOCK_SIZE; if (base_addr == flashLayout[0].sector_start) { /* let the boot block manager handle it */ result = FlashAddToBlock(&bootBlockInfo, addr, data, len); } else { /* let the block manager handle it */ result = FlashAddToBlock(&blockInfo, addr, data, len); } } /* give the result back to the caller */ return result; } /*** end of FlashWrite ***/ /************************************************************************************//** ** \brief Erases the flash memory. Note that this function also checks that no ** data is erased outside the flash memory region, so the bootloader can ** never be erased. ** \param addr Start address. ** \param len Length in bytes. ** \return BLT_TRUE if successful, BLT_FALSE otherwise. ** ****************************************************************************************/ blt_bool FlashErase(blt_addr addr, blt_int32u len) { blt_bool result = BLT_TRUE; blt_int8u first_sector_idx; blt_int8u last_sector_idx; /* validate the len parameter */ if ((len - 1) > (FLASH_END_ADDRESS - addr)) { result = BLT_FALSE; } /* only continue if all is okay so far */ if (result == BLT_TRUE) { /* obtain the first and last sector entry indices to the flashLayout[] array. */ first_sector_idx = FlashGetSectorIdx(addr); last_sector_idx = FlashGetSectorIdx(addr+len-1); /* check them */ if ((first_sector_idx == FLASH_INVALID_SECTOR_IDX) || (last_sector_idx == FLASH_INVALID_SECTOR_IDX)) { result = BLT_FALSE; } } /* only continue if all is okay so far */ if (result == BLT_TRUE) { /* erase the sectors */ result = FlashEraseSectors(first_sector_idx, last_sector_idx); } /* give the result back to the caller */ return result; } /*** end of FlashErase ***/ /************************************************************************************//** ** \brief Writes a checksum of the user program to non-volatile memory. This is ** performed once the entire user program has been programmed. Through ** the checksum, the bootloader can check if the programming session ** was completed, which indicates that a valid user programming is ** present and can be started. ** \return BLT_TRUE if successful, BLT_FALSE otherwise. ** ****************************************************************************************/ blt_bool FlashWriteChecksum(void) { blt_bool result = BLT_TRUE; blt_int32u signature_checksum = 0; /* TODO ##Port Calculate and write the signature checksum such that it appears at the * address configured with macro BOOT_FLASH_VECTOR_TABLE_CS_OFFSET. Use the * FlashWrite() function for the actual write operation. For a typical microcontroller, * the bootBlock holds the program code that includes the user program's interrupt * vector table and after which the 32-bit for the signature checksum is reserved. * * Note that this means one extra dummy entry must be added at the end of the user * program's vector table to reserve storage space for the signature checksum value, * which is then overwritten by this function. * * The example here calculates a signature checksum by summing up the first 32-bit * values in the bootBlock (so the first 7 interrupt vectors) and then taking the * Two's complement of this sum. You can modify this to anything you like as long as * the signature checksum is based on program code present in the bootBlock. */ /* first check that the bootblock contains valid data. if not, this means the * bootblock is not part of the reprogramming this time and therefore no * new checksum needs to be written */ if (bootBlockInfo.base_addr != FLASH_INVALID_ADDRESS) { #if (BOOT_FLASH_CRYPTO_HOOKS_ENABLE > 0) /* perform decryption of the bootblock, before calculating the checksum and writing it * to flash memory. */ if (FlashCryptoDecryptDataHook(bootBlockInfo.data, FLASH_WRITE_BLOCK_SIZE) == BLT_FALSE) { result = BLT_FALSE; } #endif /* only continue if all is okay so far */ if (result == BLT_TRUE) { /* compute the checksum. note that the user program's vectors are not yet written * to flash but are present in the bootblock data structure at this point. */ signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x00])); signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x04])); signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x08])); signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x0C])); signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x10])); signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x14])); signature_checksum += *((blt_int32u *)(&bootBlockInfo.data[0+0x18])); signature_checksum = ~signature_checksum; /* one's complement */ signature_checksum += 1; /* two's complement */ /* write the checksum */ result = FlashWrite(flashLayout[0].sector_start+BOOT_FLASH_VECTOR_TABLE_CS_OFFSET, sizeof(blt_addr), (blt_int8u *)&signature_checksum); } } /* give the result back to the caller */ return result; } /*** end of FlashWriteChecksum ***/ /************************************************************************************//** ** \brief Verifies the checksum, which indicates that a valid user program is ** present and can be started. ** \return BLT_TRUE if successful, BLT_FALSE otherwise. ** ****************************************************************************************/ blt_bool FlashVerifyChecksum(void) { blt_bool result = BLT_TRUE; blt_int32u signature_checksum = 0; /* TODO ##Port Implement code here that basically does the reverse of * FlashWriteChecksum(). Just make sure to read the values directory from flash memory * and NOT from the bootBlock. * The example implementation reads the first 7 32-bit from the user program flash * memory and sums them up. The signature checksum written by FlashWriteChecksum() was * the Two complement's value. This means that if you add the previously written * signature checksum value to the sum of the first 7 32-bit values, the result is * a value of 0 in case the signature checksum is valid. */ /* verify the checksum based on how it was written by FlashWriteChecksum(). */ signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start)); signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x04)); signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x08)); signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x0C)); signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x10)); signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x14)); signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+0x18)); /* add the checksum value that was written by FlashWriteChecksum(). Since this was a * Two complement's value, the resulting value should equal 0. */ signature_checksum += *((blt_int32u *)(flashLayout[0].sector_start+BOOT_FLASH_VECTOR_TABLE_CS_OFFSET)); /* sum should add up to an unsigned 32-bit value of 0 */ if (signature_checksum != 0) { /* checksum not okay */ result = BLT_FALSE; } /* give the result back to the caller */ return result; } /*** end of FlashVerifyChecksum ***/ /************************************************************************************//** ** \brief Finalizes the flash driver operations. There could still be data in ** the currently active block that needs to be flashed. ** \return BLT_TRUE if successful, BLT_FALSE otherwise. ** ****************************************************************************************/ blt_bool FlashDone(void) { blt_bool result = BLT_TRUE; /* check if there is still data waiting to be programmed in the boot block */ if (bootBlockInfo.base_addr != FLASH_INVALID_ADDRESS) { if (FlashWriteBlock(&bootBlockInfo) == BLT_FALSE) { /* update the result value to flag the error */ result = BLT_FALSE; } } /* only continue if all is okay so far */ if (result == BLT_TRUE) { /* check if there is still data waiting to be programmed */ if (blockInfo.base_addr != FLASH_INVALID_ADDRESS) { if (FlashWriteBlock(&blockInfo) == BLT_FALSE) { /* update the result value to flag the error */ result = BLT_FALSE; } } } /* give the result back to the caller */ return result; } /*** end of FlashDone ***/ /************************************************************************************//** ** \brief Obtains the base address of the flash memory available to the user program. ** This is basically the first address in the flashLayout table. ** \return Base address. ** ****************************************************************************************/ blt_addr FlashGetUserProgBaseAddress(void) { blt_addr result; result = flashLayout[0].sector_start; /* give the result back to the caller */ return result; } /*** end of FlashGetUserProgBaseAddress ***/ /************************************************************************************//** ** \brief Copies data currently in flash to the block->data and sets the ** base address. ** \param block Pointer to flash block info structure to operate on. ** \param address Base address of the block data. ** \return BLT_TRUE if successful, BLT_FALSE otherwise. ** ****************************************************************************************/ static blt_bool FlashInitBlock(tFlashBlockInfo *block, blt_addr address) { blt_bool result = BLT_TRUE; /* check address alignment */ if ((address % FLASH_WRITE_BLOCK_SIZE) != 0) { /* update the result value to flag the error */ result = BLT_FALSE; } /* only continue if all is okay so far */ if (result == BLT_TRUE) { /* make sure that we are initializing a new block and not the same one */ if (block->base_addr != address) { /* set the base address and copies the current data from flash */ block->base_addr = address; CpuMemCopy((blt_addr)block->data, address, FLASH_WRITE_BLOCK_SIZE); } } /* give the result back to the caller */ return result; } /*** end of FlashInitBlock ***/ /************************************************************************************//** ** \brief Switches blocks by programming the current one and initializing the ** next. ** \param block Pointer to flash block info structure to operate on. ** \param base_addr Base address of the next block. ** \return The pointer of the block info struct that is now being used, or a NULL ** pointer in case of error. ** ****************************************************************************************/ static tFlashBlockInfo *FlashSwitchBlock(tFlashBlockInfo *block, blt_addr base_addr) { tFlashBlockInfo * result = BLT_NULL; /* check if a switch needs to be made away from the boot block. in this case the boot * block shouldn't be written yet, because this is done at the end of the programming * session by FlashDone(), this is right after the checksum was written. */ if (block == &bootBlockInfo) { /* switch from the boot block to the generic block info structure */ block = &blockInfo; result = block; } /* check if a switch back into the bootblock is needed. in this case the generic block * doesn't need to be written here yet. */ else if (base_addr == flashLayout[0].sector_start) { /* switch from the generic block to the boot block info structure */ block = &bootBlockInfo; base_addr = flashLayout[0].sector_start; result = block; } /* no switching between the generic block and the bootblock needed. it is a switch * within a generic block. the current block needs to be first programmed before a * switch to the new one can be make. */ else { /* start by initializing the result to success */ result = block; /* need to switch to a new block, so program the current one and init the next */ if (FlashWriteBlock(block) == BLT_FALSE) { /* invalidate the result value to flag the error */ result = BLT_NULL; } } /* only continue if all is okay sofar */ if (result != BLT_NULL) { /* initialize the new block when necessary */ if (FlashInitBlock(block, base_addr) == BLT_FALSE) { /* invalidate the result value to flag the error */ result = BLT_NULL; } } /* Give the result back to the caller. */ return result; } /*** end of FlashSwitchBlock ***/ /************************************************************************************//** ** \brief Programming is done per block. This function adds data to the block ** that is currently collecting data to be written to flash. If the ** address is outside of the current block, the current block is written ** to flash an a new block is initialized. ** \param block Pointer to flash block info structure to operate on. ** \param address Flash destination address. ** \param data Pointer to the byte array with data. ** \param len Number of bytes to add to the block. ** \return BLT_TRUE if successful, BLT_FALSE otherwise. ** ****************************************************************************************/ static blt_bool FlashAddToBlock(tFlashBlockInfo *block, blt_addr address, blt_int8u *data, blt_int32u len) { blt_bool result = BLT_TRUE; blt_addr current_base_addr; blt_int8u *dst; blt_int8u *src; /* determine the current base address */ current_base_addr = (address/FLASH_WRITE_BLOCK_SIZE)*FLASH_WRITE_BLOCK_SIZE; /* make sure the blockInfo is not uninitialized */ if (block->base_addr == FLASH_INVALID_ADDRESS) { /* initialize the blockInfo struct for the current block */ if (FlashInitBlock(block, current_base_addr) == BLT_FALSE) { result = BLT_FALSE; } } /* only continue if all is okay so far */ if (result == BLT_TRUE) { /* check if the new data fits in the current block */ if (block->base_addr != current_base_addr) { /* need to switch to a new block, so program the current one and init the next */ block = FlashSwitchBlock(block, current_base_addr); if (block == BLT_NULL) { result = BLT_FALSE; } } } /* only continue if all is okay so far */ if (result == BLT_TRUE) { /* add the data to the current block, but check for block overflow */ dst = &(block->data[address - block->base_addr]); src = data; do { /* keep the watchdog happy */ CopService(); /* buffer overflow? */ if ((blt_addr)(dst-&(block->data[0])) >= FLASH_WRITE_BLOCK_SIZE) { /* need to switch to a new block, so program the current one and init the next */ block = FlashSwitchBlock(block, current_base_addr+FLASH_WRITE_BLOCK_SIZE); if (block == BLT_NULL) { /* flag error and stop looping */ result = BLT_FALSE; break; } /* reset destination pointer */ dst = &(block->data[0]); } /* write the data to the buffer */ *dst = *src; /* update pointers */ dst++; src++; /* decrement byte counter */ len--; } while (len > 0); } /* give the result back to the caller */ return result; } /*** end of FlashAddToBlock ***/ /************************************************************************************//** ** \brief Programs FLASH_WRITE_BLOCK_SIZE bytes to flash from the block->data ** array. ** \param block Pointer to flash block info structure to operate on. ** \return BLT_TRUE if successful, BLT_FALSE otherwise. ** ****************************************************************************************/ static blt_bool FlashWriteBlock(tFlashBlockInfo *block) { blt_bool result = BLT_TRUE; blt_addr prog_addr; blt_int32u prog_data; blt_int32u word_cnt; /* check that the address is actually within flash */ if (FlashGetSectorIdx(block->base_addr) == FLASH_INVALID_SECTOR_IDX) { result = BLT_FALSE; } #if (BOOT_FLASH_CRYPTO_HOOKS_ENABLE > 0) #if (BOOT_NVM_CHECKSUM_HOOKS_ENABLE == 0) /* note that the bootblock is already decrypted in FlashWriteChecksum(), if the * internal checksum mechanism is used. Therefore don't decrypt it again. */ if (block != &bootBlockInfo) #endif { /* perform decryption of the program data before writing it to flash memory. */ if (FlashCryptoDecryptDataHook(block->data, FLASH_WRITE_BLOCK_SIZE) == BLT_FALSE) { result = BLT_FALSE; } } #endif /* only continue if all is okay so far */ if (result == BLT_TRUE) { /* TODO ##Port Program the data contents in 'block' to flash memory here and read the * programmed data values back directory from flash memory to verify that the flash * program operation was successful. The example implementation assumes that flash * data can be written 32-bits at a time. */ /* program all words in the block one by one */ for (word_cnt=0; word_cnt<(FLASH_WRITE_BLOCK_SIZE/sizeof(blt_int32u)); word_cnt++) { prog_addr = block->base_addr + (word_cnt * sizeof(blt_int32u)); prog_data = *(volatile blt_int32u *)(&block->data[word_cnt * sizeof(blt_int32u)]); /* keep the watchdog happy */ CopService(); /* TODO ##Port Program 32-bit 'prog_data' data value to memory address 'prog_addr'. * In case an error occured, set result to BLT_FALSE and break the loop. */ if (1 == 0) { result = BLT_FALSE; break; } /* verify that the written data is actually there */ if (*(volatile blt_int32u *)prog_addr != prog_data) { /* TODO ##Port Uncomment the following two lines again. It was commented out so * that a dry run with the flash driver is possible without it reporting errors. */ /*result = BLT_FALSE;*/ /*break;*/ } } } /* Give the result back to the caller. */ return result; } /*** end of FlashWriteBlock ***/ /************************************************************************************//** ** \brief Erases the flash sectors from indices first_sector_idx up until ** last_sector_idx into the flashLayout[] array. ** \param first_sector_idx First flash sector number index into flashLayout[]. ** \param last_sector_idx Last flash sector number index into flashLayout[]. ** \return BLT_TRUE if successful, BLT_FALSE otherwise. ** ****************************************************************************************/ static blt_bool FlashEraseSectors(blt_int8u first_sector_idx, blt_int8u last_sector_idx) { blt_bool result = BLT_TRUE; blt_int8u sectorIdx; blt_addr sectorBaseAddr; blt_int32u sectorSize; /* validate the sector numbers */ if (first_sector_idx > last_sector_idx) { result = BLT_FALSE; } /* only continue if all is okay so far */ if (result == BLT_TRUE) { if (last_sector_idx > (FLASH_TOTAL_SECTORS-1)) { result = BLT_FALSE; } } /* only continue if all is okay so far */ if (result == BLT_TRUE) { /* erase the sectors one by one */ for (sectorIdx = first_sector_idx; sectorIdx <= last_sector_idx; sectorIdx++) { /* service the watchdog */ CopService(); /* get information about the sector */ sectorBaseAddr = flashLayout[sectorIdx].sector_start; sectorSize = flashLayout[sectorIdx].sector_size; /* validate the sector information */ if ( (sectorBaseAddr == FLASH_INVALID_ADDRESS) || (sectorSize == 0) ) { /* invalid sector information. flag error and abort erase operation */ result = BLT_FALSE; break; } /* TODO ##Port Perform the flash erase operation of a sector that starts at * 'sectorBaseAddr' and has a length of 'sectorSize' bytes. In case an error * occured, set result to BLT_FALSE and break the loop. */ if(1 == 0) { /* could not perform erase operation */ result = BLT_FALSE; /* error detected so don't bother continuing with the loop */ break; } } } /* give the result back to the caller */ return result; } /*** end of FlashEraseSectors ***/ /************************************************************************************//** ** \brief Determines the index into the flashLayout[] array of the flash sector that ** the specified address is in. ** \param address Address in the flash sector. ** \return Flash sector index in flashLayout[] or FLASH_INVALID_SECTOR_IDX. ** ****************************************************************************************/ static blt_int8u FlashGetSectorIdx(blt_addr address) { blt_int8u result = FLASH_INVALID_SECTOR_IDX; blt_int8u sectorIdx; /* search through the sectors to find the right one */ for (sectorIdx = 0; sectorIdx < FLASH_TOTAL_SECTORS; sectorIdx++) { /* keep the watchdog happy */ CopService(); /* is the address in this sector? */ if ((address >= flashLayout[sectorIdx].sector_start) && \ (address < (flashLayout[sectorIdx].sector_start + \ flashLayout[sectorIdx].sector_size))) { /* update the result value and stop looping */ result = sectorIdx; break; } } /* give the result back to the caller */ return result; } /*** end of FlashGetSectorIdx ***/ /*********************************** end of flash.c ************************************/