[U-Boot] [PATCH 1/3] config: introduce a generic $bootcmd

Tom Rini
2014-08-11T19:19:21Z

On Mon, Aug 11, 2014 at 12:55:43PM -0600, Stephen Warren wrote:
> On 08/11/2014 12:42 PM, Jeroen Hofstee wrote:
> >Hello Stephen.
> >
> >On 11-08-14 20:04, Stephen Warren wrote:
> >>On 08/11/2014 11:51 AM, Jeroen Hofstee wrote:
> >>>Hello Stephan
> >>>
> >>>On 11-08-14 18:53, Stephen Warren wrote:
> >>>>On 08/10/2014 10:53 AM, Jeroen Hofstee wrote:
> >>>>>Hello Stephan,
> >>>>>
> >>>>>On 10-08-14 05:11, Stephen Warren wrote:
> >>>>>>The entire point of this series is to prevent distros from having to
> >>>>>>install bootloader-specific boot configuration files.
> >>>>>
> >>>>>I fail to see why this is something to pursue. Since the distro knows
> >>>>>the boot path, why should u-boot be polling all possible options?
> >>>>
> >>>>This patch series allows U-Boot to find the OS and boot it. U-Boot is
> >>>>searching for some kind of boot configuration file.
> >>>>
> >>>>This part of the process is the same as the BIOS searching all known
> >>>>possible boot devices for a partition marked bootable, and with a
> >>>>valid MBR. Or, it's the same as UEFI searching all possible boot
> >>>>devices for whatever config file or boot binary is mandated by UEFI.
> >>>
> >>>Not in my mind, I am not against scanning the possible
> >>>boot devices, on the contrary, I am trying to add booting
> >>>the userland from usb instead of mmc for the rpi_b.
> >>
> >>The following will tell U-Boot to only search USB for extlinux.conf.
> >>
> >>setenv boot_targets usb
> >>
> >>(you can put this into /uEnv.txt on the SD card if you want to avoid
> >>editing U-Boot source code to make this change; there's no persistent
> >>environment storage on the Pi, at least at the moment)
> >>
> >
> >I am going to give up soon commenting on this. It is
> >applied anyway. My point is that I am making an image
> >without an extlinux.conf, I know that, I could tell it in a
> >boot.scr but yet this scripts now insist on searching for
> >extlinux.conf.
>
> That's because you are an individual crafting your own installation
> manually. The whole point of this feature is to allow distros to be
> completely generic, i.e. they work in the exact same way on all HW
> (that supports this feature, which hopefully will be most ARM boards
> soon...).

I suspect the problem here is that you're mentally thinking "... Linux
..." and Jeroen's use case is mainly "... Not Linux ...".

So this is a step in the right direction, which is why I applied it, but
it may need a little tweaking to make it less noisy to support *BSD or
VxWorks or ..., which are real users out there for U-Boot and we don't
want to forget them.

--
Tom
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