[U-Boot] [PATCH v2] arm: imx: Switch Wandboard to use config_distro_bootcmd.h.

[Otavio Salvador]

On Wed, Oct 28, 2015 at 1:59 AM, Vagrant Cascadian <vagrant at debian.org> wrote:
> On 2015-10-27, Fabio Estevam wrote:
>> On Tue, Oct 27, 2015 at 5:49 PM, Vagrant Cascadian <vagrant at debian.org> wrote:
>>
>>> +#define BOOT_TARGET_DEVICES(func) \
>>> +       func(MMC, mmc, 0) \
>>> +       func(MMC, mmc, 1) \
>>> +       func(USB, usb, 0) \
>>> +       func(PXE, pxe, na) \
>>> +       func(DHCP, dhcp, na)
>>
>>
>> I never used config_distro_bootcmd, so let me ask you: is there a TFTP
>> variant for func() as well?
>
> Both PXE and DHCP download an extlinux-style config (or boot script) via
> TFTP, which then decides what kernel, initrd, dtb, etc. to load. Other
> boot methods work similarly, loading from local media.
>
>
>> In the current script we can switch from TFTP/DHCP very easily.
>
> You can override the default boot order by changing the boot_targets variable.
>
>
>> Also, how can do we switch from booting the rootfs from mmc versus NFS mount?
>
> That would be defined in the extlinux-style config or boot script.
>
>
> So, it doesn't exactly replicate the prior functionality, though it
> provides similar methods.
>
> This is why I originally proposed to make it fallback to the old
> behavior, then you could set boot_targets to empty and still have the
> old style booting; but opinions may differ on all this. :)
>
> Mostly, I'm seeking to standardize on a common configuration for as many
> boards as we can in Debian (and ideally in upstream u-boot, to minimize
> long-term maintenance), so that various supported boards at least behave
> similarly by default.
>
> A lot of goals and functionality is documented reasonably well in
> doc/README.distro.

Agreed and I think for community and reference boards the distro
environment provides some benefits as standardization and flexibility.

-- 
Otavio Salvador                             O.S. Systems
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