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| author | Gerlando Falauto <gerlando.falauto@keymile.com> | 2013-08-27 19:13:57 +0530 |
|---|---|---|
| committer | Jagannadha Sutradharudu Teki <jaganna@xilinx.com> | 2013-08-27 19:39:39 +0530 |
| commit | b95f958d7d06b3cd117647b29b288cf168aa2ee9 (patch) | |
| tree | 226a0664372a763bf9c8941debb3ff64b02e7916 | |
| parent | a928a36ff91ba585310491f2d8c08ec2d30bc2b0 (diff) | |
| download | u-boot-imx-b95f958d7d06b3cd117647b29b288cf168aa2ee9.zip u-boot-imx-b95f958d7d06b3cd117647b29b288cf168aa2ee9.tar.gz u-boot-imx-b95f958d7d06b3cd117647b29b288cf168aa2ee9.tar.bz2 | |
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>
| -rw-r--r-- | common/cmd_sf.c | 13 |
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; } |