[U-Boot] [PATCH] wandboard: add pxe support, set default boot command like highbank

[Stefano Babic <sbabic@denx.de>]

Hi Dennis,

On 01/08/2013 19:06, Dennis Gilmore wrote:
> 
> ultimately I want to have a standard way to boot any system that just
> works and does not need the installer to know or care what the target
> system is. using boot.scr and uEnv.txt does not work for my goals.
> 

Let's go away from the concrete scripts u-boot.scr and env.txt. What I
find sick is that even the smallest change in a variable requires a new
u-boot image, while the environment itself is thought from the beginning
to be independent from the code.

>>> I know it's bikeshedding, but most boards can be converted to just:
>>>
>>> #define CONFIG_BOOTCOMMAND \
>>> 	"mmc dev ${mmcdev};" \
>>> 	"if mmc rescan; then " \
>>> 		"echo SD/MMC found on device ${mmcdev};" \
>>> 		"if run loadbootenv; then " \
>>> 			"run importbootenv;" \
>>> 		"fi;" \
>>> 		"if test -n $uenvcmd; then " \
>>> 			"echo Running uenvcmd ...;" \
>>> 			"run uenvcmd;" \
>>> 		"fi;" \
>>> 		"if run loadsomefailsafedefault; then " \
>>> 			"run mmcboot;" \
>>> 		"fi;" \
>>> 	"fi;"
>>> #endif
> 
> ultimately for Fedora we do not want to use uEnv.txt or boot.scr at all
> we want to use a extlinux.conf file and sysboot provided by cmd_pxe the
> rest is to provide flexibility and options to users to choose different
> ways to boot. the above is not at all suitable. 
> 

This is already an example where the dafult environment is perfectly
suitable for someone but not for everybody. And of course, there are a
wide range of storage device where scripts are stored: not all boards
have MMC. I am thinking if we can have in the CONFIG_EXTRA_ENV_SETTINGS
a general command to load the whole environment, letting the whole logic
with scripts outside of the code.

Best regards,
Stefano Babic

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