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authorGerlando Falauto <gerlando.falauto@keymile.com>2013-08-27 19:13:57 +0530
committerJagannadha Sutradharudu Teki <jaganna@xilinx.com>2013-08-27 19:39:39 +0530
commitb95f958d7d06b3cd117647b29b288cf168aa2ee9 (patch)
tree226a0664372a763bf9c8941debb3ff64b02e7916 /common
parenta928a36ff91ba585310491f2d8c08ec2d30bc2b0 (diff)
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cmd_sf: let "sf update" preserve the final part of the last sector
Since "sf update" erases the last block as a whole, but only rewrites the meaningful initial part of it, the rest would be left erased, potentially erasing meaningful information. So, as a safety measure, have it rewrite the original content. Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com> Cc: Valentin Longchamp <valentin.longchamp@keymile.com> Cc: Holger Brunck <holger.brunck@keymile.com> Acked-by: Simon Glass <sjg@chromium.org> Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Diffstat (limited to 'common')
-rw-r--r--common/cmd_sf.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/common/cmd_sf.c b/common/cmd_sf.c
index 4af0f0a..3f60979 100644
--- a/common/cmd_sf.c
+++ b/common/cmd_sf.c
@@ -152,8 +152,10 @@ static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
{
debug("offset=%#x, sector_size=%#x, len=%#zx\n",
offset, flash->sector_size, len);
- if (spi_flash_read(flash, offset, len, cmp_buf))
+ /* Read the entire sector so to allow for rewriting */
+ if (spi_flash_read(flash, offset, flash->sector_size, cmp_buf))
return "read";
+ /* Compare only what is meaningful (len) */
if (memcmp(cmp_buf, buf, len) == 0) {
debug("Skip region %x size %zx: no change\n",
offset, len);
@@ -163,8 +165,17 @@ static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
/* Erase the entire sector */
if (spi_flash_erase(flash, offset, flash->sector_size))
return "erase";
+ /* Write the initial part of the block from the source */
if (spi_flash_write(flash, offset, len, buf))
return "write";
+ /* If it's a partial sector, rewrite the existing part */
+ if (len != flash->sector_size) {
+ /* Rewrite the original data to the end of the sector */
+ if (spi_flash_write(flash, offset + len,
+ flash->sector_size - len, &cmp_buf[len]))
+ return "write";
+ }
+
return NULL;
}