[U-Boot] [PATCH] lsxl: Add documentation how to flash an unmodified board

[Michael Walle]

Am 6. Juni 2018 11:38:56 MESZ schrieb Bastian Germann <bastiangermann at fishpost.de>:
>Signed-off-by: Bastian Germann <bastian.germann at fishpost.de>
>---
> board/buffalo/lsxl/README | 17 ++++++++++++++++-
> 1 file changed, 16 insertions(+), 1 deletion(-)
>
>diff --git a/board/buffalo/lsxl/README b/board/buffalo/lsxl/README
>index ef5ed42880..3ede081776 100644
>--- a/board/buffalo/lsxl/README
>+++ b/board/buffalo/lsxl/README
>@@ -111,7 +111,7 @@ rescue
>   See `Rescue Mode` for more information.
> 
>You can change the boot source by setting the 'bootsource' variable to
>the
>-corresponding value. Please note, that the restore_env script will the
>the
>+corresponding value. Please note, that the restore_env script will set
>the
> bootsource back to 'legacy'.

haha had to read twice to see the difference. nice catch. 

> 
>@@ -137,3 +137,18 @@ you already have a bootloader CLI, you can use the
>following commands:
>  bootp ${loadaddr} u-boot.kwb
>  sf erase 0 +${filelen}
>  sf write 0 ${fileaddr} ${filesize}
>+
>+As netconsole is unavailable in the Buffalo U-Boot version, you can
>only
>+flash via bootloader CLI if you modify the board. If you do not want
>to do
>+that, you can flash from GNU/Linux with the flashrom utility. You have
>to
>+have the flash chip available as a spidev device, which you can get by
>+enabling Linux configuration option CONFIG_SPI_SPIDEV and adding a
>spidev
>+compatible device in the device tree available in the Linux source
>tree as
>+arch/arm/boot/dts/kirkwood-lsxl.dtsi
>+
>+The flashing is then done with the following commands:
>+
>+ flashrom -r dump.bin -p linux_spi:dev=/dev/spidev0.0
>+ truncate -s 384K u-boot.kwb
>+ dd conv=notrunc if=u-boot.kwb of=dump.bin
>+ flashrom -w dump.bin -p linux_spi:dev=/dev/spidev0.0

i guess there is no need for flashrom and raw spi access if you're using the MTD layer (flash_erase /dev/mtd0 0 0 and dd to /dev/mtd0). any advantages of using flash_rom? 

-michael