[U-Boot] u-boot USB question

[Michael Trimarchi <michael@amarulasolutions.com>]

Hi

On 17/05/13 05:04, Bo Shen wrote:
> Hi Lance,
> 
> On 5/17/2013 10:20, Lance Beck wrote:
>> Thanks Bo!
>>
>> My thinking with fw_printev (setenv) was that I would use it to set the environment variables from our user space app.  This way, we can control when the USB stick will be used for a kernel or rootfs upgrade.  Any thoughts on show this could be scripted and run?  We would like to be able to have a customer in the field do this without having to do anything but send a command from the user app, insert the USB drive and reboot.
> 

If the cpu doesn't have any register for rebooting reason, you can write in environment a variable
that said that you want update at the next reboot and then using and autoscript you can flash it

Michael 

> Maybe you can test reference in <include/configs/am3517_evm.h>
> ---8>---
> #define CONFIG_EXTRA_ENV_SETTINGS \
>         "loadaddr=0x82000000\0" \
>         "console=ttyO2,115200n8\0" \
>         "mmcdev=0\0" \
>         "mmcargs=setenv bootargs console=${console} " \
>                 "root=/dev/mmcblk0p2 rw rootwait\0" \
>         "nandargs=setenv bootargs console=${console} " \
>                 "root=/dev/mtdblock4 rw " \
>                 "rootfstype=jffs2\0" \
>         "loadbootscript=fatload mmc ${mmcdev} ${loadaddr} boot.scr\0" \
>         "bootscript=echo Running bootscript from mmc ...; " \
>                 "source ${loadaddr}\0" \
>         "loaduimage=fatload mmc ${mmcdev} ${loadaddr} uImage\0" \
>         "mmcboot=echo Booting from mmc ...; " \
>                 "run mmcargs; " \
>                 "bootm ${loadaddr}\0" \
>         "nandboot=echo Booting from nand ...; " \
>                 "run nandargs; " \
>                 "nand read ${loadaddr} 280000 400000; " \
>                 "bootm ${loadaddr}\0" \
> 
> #define CONFIG_BOOTCOMMAND \
>         "mmc dev ${mmcdev}; if mmc rescan; then " \
>                 "if run loadbootscript; then " \
>                         "run bootscript; " \
>                 "else " \
>                         "if run loaduimage; then " \
>                                 "run mmcboot; " \
>                         "else run nandboot; " \
>                         "fi; " \
>                 "fi; " \
>         "else run nandboot; fi"
> ---<8---
> 
> Best Regards,
> Bo Shen
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