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129 lines
3.6 KiB
129 lines
3.6 KiB
/*
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* nandboot.c - NAND boot mode functions
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*
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* Copyright (C) 2008 Hugo Villeneuve <hugo@hugovil.com>
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*
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* Based on TI DaVinci Flash and Boot Utilities, original copyright follows:
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* Copyright 2008 Texas Instruments, Inc. <www.ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "common.h"
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#include "nand.h"
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#include "util.h"
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#include "uart.h"
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static uint8_t nand_header[MAX_PAGE_SIZE] __attribute__((section(".ddrram")));
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/*
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* Find out where the application is and copy to RAM
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* jump_entry_point: Entry point for application we are decoding out of
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* flash
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*/
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int
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nand_copy(uint32_t *jump_entry_point)
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{
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uint32_t count, start_block;
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uint32_t i;
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uint32_t magicNum;
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uint32_t block, page;
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uint32_t readError = E_FAIL;
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int failedOnceAlready = false;
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uint8_t *rxBuf; /* Temporary buffer to load header in NAND */
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struct nand_image_descriptor_t im_desc;
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int last_header_block;
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start_block = START_UBOOT_BLOCK_NUM;
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last_header_block = END_UBOOT_BLOCK_NUM;
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NAND_startAgain:
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failedOnceAlready = false;
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/* Read header about application starting at START_UBOOT_BLOCK_NUM, Page 0
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* and try 50 blocks. */
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for (count = start_block; count <= last_header_block; count++) {
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if (nand_read_page(count, 0, nand_header) != E_PASS)
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continue;
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magicNum = *((uint32_t *) nand_header);
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/* Valid magic number found */
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if ((magicNum & MAGIC_NUMBER_MASK) == MAGIC_NUMBER_VALID) {
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start_block = count;
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break;
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}
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}
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/* Never found valid header. */
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if (count > last_header_block)
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return E_FAIL;
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memcpy((void *) &im_desc, nand_header, sizeof(im_desc));
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uart_send_str("Image infos: Magic = ");
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uart_send_hexnum(im_desc.magic, 8);
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uart_send_str(", Entry = ");
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uart_send_hexnum(im_desc.entry_point, 8);
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uart_send_str(", Pages = ");
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uart_send_hexnum(im_desc.size_in_pages, 8);
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uart_send_str(", Load = ");
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uart_send_hexnum(im_desc.load_address, 8);
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uart_send_str(", Block = ");
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uart_send_hexnum(im_desc.block_num, 8);
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uart_send_lf();
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rxBuf = (uint8_t *) im_desc.load_address;
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NAND_retry:
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/* initialize block and page number to be used for read */
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block = im_desc.block_num;
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page = im_desc.page_num;
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/* Perform the actual copying of the application from NAND to RAM */
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for (i = 0; i < im_desc.size_in_pages; i++) {
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/* if page goes beyond max number of pages increment block
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* number and reset page number */
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if (page >= nand_get_pages_per_block()) {
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page = 0;
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block++;
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}
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/* Copy the data */
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readError =
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nand_read_page(block, page++,
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&rxBuf[i * nand_get_bytes_per_page()]);
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/*
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* We attempt to read the app data twice. If we fail twice then
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* we go look for a new application header in the NAND flash at
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* the next block.
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*/
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if (readError != E_PASS) {
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if (failedOnceAlready) {
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start_block++;
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goto NAND_startAgain;
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} else {
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failedOnceAlready = true;
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goto NAND_retry;
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}
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}
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}
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/* Application was read correctly, so set entrypoint */
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*jump_entry_point = im_desc.entry_point;
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return E_PASS;
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}
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