Hi Jagan, On Wed, 16 Oct 2013 11:16:49 +0530, Jagan Teki <jagannadh.t...@gmail.com> wrote:
> Hi, > > On Tue, Oct 15, 2013 at 11:27 PM, Martin Fuzzey <mfuz...@parkeon.com> wrote: > > When writing buffers that are not 32 bit aligned data loss occurs. > > > > This can also occur when the total transfer size is not a multiple of 4 > > bytes > > since the extra bytes are written first causing the rest to be unaligned. > > > > This can be seen by writing to SPI flash a 57 byte file containing 00 01 .. > > 38: > > > > U-Boot > dhcp data.bin > > ... > > Bytes transferred = 57 (39 hex) > > U-Boot > md.b $loadaddr > > 72000000: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f > > ................ > > 72000010: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f > > ................ > > 72000020: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f > > !"#$%&'()*+,-./ > > 72000030: 30 31 32 33 34 35 36 37 38 ff ff ff ff ff ff ff > > 012345678....... > > U-Boot > sf write $loadaddr 0 $filesize > > > > U-Boot > mw.b $loadaddr ff 100 > > U-Boot > sf read $loadaddr 0 100 > > U-Boot > md.b $loadaddr > > 72000000: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f > > ................ > > 72000010: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f > > ................ > > 72000020: 20 21 22 23 24 29 2a 2b 2c 31 32 33 34 ff ff ff > > !"#$)*+,1234... > > 72000030: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > > ................ > > > > [bytes 25-28, 2d-30, 35-38 are missing] > > > > Activating debug in the write command gave: > > spi_xchg_single: bitlen 256 dout 0x72000000 din 0x0 > > Sending SPI 0x10203 > > Sending SPI 0x4050607 > > Sending SPI 0x8090a0b > > Sending SPI 0xc0d0e0f > > Sending SPI 0x10111213 > > Sending SPI 0x14151617 > > Sending SPI 0x18191a1b > > Sending SPI 0x1c1d1e1f > > SPI Rx: 0xffffffff 0xffffffff > > ... > > SPI Rx: 0xffffffff 0xffffffff > > spi_xchg_single: bitlen 200 dout 0x72000020 din 0x0 > > Sending SPI 0x20 > > Sending SPI 0x21222324 > > Sending SPI 0x292a2b2c <=== What happened to 25262728? > > Sending SPI 0x31323334 > > Sending SPI 0xffffffff > > ... > > SF: program success 57 bytes @ 0x0 > Thanks for your log, for showing the exact issues. Agreed, but I think this log could go in a comment below the '---' line, so that the commit message focuses on describing what the patch does, rather than how it was found out necessary. Amicalement, -- Albert. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
