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fastboot: sparse: implement reserve() 

In order to process the CHUNK_TYPE_DONT_CARE properly, there is
a requirement to be able to 'reserve' a specified number of blocks
in the storage media. Because of the special handling of "bad blocks"
in NAND devices, this is implemented in a storage abstraction function.

Signed-off-by: Steve Rae <srae@broadcom.com>
Reviewed-by: Maxime Ripard <maxime.ripard@free-electrons.com>
This commit is contained in:
Steve Rae 2016-06-07 11:19:38 -07:00 committed by Tom Rini
parent 9bc34799c8
commit 2c72404687
4 changed files with 33 additions and 3 deletions
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7
common/fb_mmc.c
View File

@ -53,6 +53,12 @@ static lbaint_t fb_mmc_sparse_write(struct sparse_storage *info,
return blk_dwrite(dev_desc, blk, blkcnt, buffer);
}
static lbaint_t fb_mmc_sparse_reserve(struct sparse_storage *info,
lbaint_t blk, lbaint_t blkcnt)
{
return blkcnt;
}
static void write_raw_image(struct blk_desc *dev_desc, disk_partition_t *info,
const char *part_name, void *buffer,
unsigned int download_bytes)
@ -131,6 +137,7 @@ void fb_mmc_flash_write(const char *cmd, void *download_buffer,
sparse.start = info.start;
sparse.size = info.size;
sparse.write = fb_mmc_sparse_write;
sparse.reserve = fb_mmc_sparse_reserve;
printf("Flashing sparse image at offset " LBAFU "\n",
sparse.start);

20
common/fb_nand.c
View File

@ -126,6 +126,25 @@ static lbaint_t fb_nand_sparse_write(struct sparse_storage *info,
return written / info->blksz;
}
static lbaint_t fb_nand_sparse_reserve(struct sparse_storage *info,
lbaint_t blk, lbaint_t blkcnt)
{
int bad_blocks = 0;
/*
* TODO - implement a function to determine the total number
* of blocks which must be used in order to reserve the specified
* number ("blkcnt") of "good-blocks", starting at "blk"...
* ( possibly something like the "check_skip_len()" function )
*/
/*
* the return value must be 'blkcnt' ("good-blocks") plus the
* number of "bad-blocks" encountered within this space...
*/
return blkcnt + bad_blocks;
}
void fb_nand_flash_write(const char *cmd, void *download_buffer,
unsigned int download_bytes)
{
@ -155,6 +174,7 @@ void fb_nand_flash_write(const char *cmd, void *download_buffer,
sparse.start = part->offset / sparse.blksz;
sparse.size = part->size / sparse.blksz;
sparse.write = fb_nand_sparse_write;
sparse.reserve = fb_nand_sparse_reserve;
printf("Flashing sparse image at offset " LBAFU "\n",
sparse.start);

5
common/image-sparse.c
View File

@ -1,3 +1,4 @@
/*
* Copyright (c) 2009, Google Inc.
* All rights reserved.
@ -210,10 +211,8 @@ void write_sparse_image(
break;
case CHUNK_TYPE_DONT_CARE:
#ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
blk += blkcnt;
blk += info->reserve(info, blk, blkcnt);
total_blocks += chunk_header->chunk_sz;
#endif
break;
case CHUNK_TYPE_CRC32:

4
include/image-sparse.h
View File

@ -19,6 +19,10 @@ struct sparse_storage {
lbaint_t blk,
lbaint_t blkcnt,
const void *buffer);
lbaint_t (*reserve)(struct sparse_storage *info,
lbaint_t blk,
lbaint_t blkcnt);
};
static inline int is_sparse_image(void *buf)