From ed62756dcf5544e277d87c461a84c6274f42b765 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Fri, 9 Jan 2015 14:39:22 +0100 Subject: [PATCH] cmd_sf: Fix problem with "sf update" and unaligned length On SoCFPGA, using "sf update" with an non-4byte aligned length leads to a hangup (and reboot via watchdog). This is because of the unaligned access in the cadence QSPI driver which is hard to prevent since the data is written into a 4-byte wide FIFO. This patch fixes this problem by changing the behavior of the last sector write (not sector aligned). The new code is even simpler and copies the source data into the temp buffer and now uses the temp buffer to write the complete sector. So only one SPI sector write is used now instead of 2 in the old version. Signed-off-by: Stefan Roese Cc: Gerlando Falauto Cc: Valentin Longchamp Cc: Holger Brunck Acked-by: Gerlando Falauto Reviewed-by: Jagannadha Sutradharudu Teki --- common/cmd_sf.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/common/cmd_sf.c b/common/cmd_sf.c index 6aabf39302..342021df97 100644 --- a/common/cmd_sf.c +++ b/common/cmd_sf.c @@ -164,6 +164,8 @@ static int do_spi_flash_probe(int argc, char * const argv[]) static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset, size_t len, const char *buf, char *cmp_buf, size_t *skipped) { + char *ptr = (char *)buf; + debug("offset=%#x, sector_size=%#x, len=%#zx\n", offset, flash->sector_size, len); /* Read the entire sector so to allow for rewriting */ @@ -179,16 +181,14 @@ 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 it's a partial sector, copy the data into the temp-buffer */ 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"; + memcpy(cmp_buf, buf, len); + ptr = cmp_buf; } + /* Write one complete sector */ + if (spi_flash_write(flash, offset, flash->sector_size, ptr)) + return "write"; return NULL; } -- 2.30.2