[U-Boot] [PATCH v2] arm: socfpga: Enable load zImage and Linux DTB from USB

[Vagrant Cascadian <vagrant@aikidev.net>]

On 2015-11-27, Marek Vasut wrote:
> On Friday, November 27, 2015 at 01:23:34 PM, Chin Liang See wrote:
>> On Fri, 2015-11-27 at 11:36 +0100, Marek Vasut wrote:
>> > On Friday, November 27, 2015 at 03:36:42 AM, Chin Liang See wrote:
>> > > Adding new environment usbload which will load zImage and
>> > > Linux DTB from USB mass storage through FAT file system.
...
>> > The distro_bootcmd can do this and even let's you boot debian/fedora
>> > on such
>> > a machine in a standardized way. Should we switch to distro_bootcmd
>> > instead
>> > of adding new ad-hoc stuff ?
>> 
>> It seems to me that we need to add script into the fs to get that work,
>> right?

Yes and no. Currently Debian uses a bootscript generated with
flash-kernel, such as:

  https://anonscm.debian.org/cgit/d-i/flash-kernel.git/tree/bootscript/all/bootscr.uboot-generic

But you can also use a syslinux formatted plain text file, such as
extlinux.conf or pxelinux.conf/default, described in
u-boot/doc/README.distro. They look something like this:

  label Boot
  kernel /boot/vmlinuz
  append ro root=/dev/sda2 console=ttyS0,115200n8
  fdtdir /boot/dtbs/
  initrd /boot/initrd.img

The (only) reason debian hasn't yet switched to syslinux-style config
files is that is that the console settings vary wildly by board, and the
"chosen" console property isn't yet consistantly supported on all boards
and kernel versions in use. That may change soon.

But the distro_bootcmd support supports both syslinux-style files and
bootscripts out-of-the-box. Because of the standardization, for any
board you would hope to see working out of the box on Debian(and I
suspect Fedora as well), supporting distro_bootcmd in u-boot upstream
would be ideal.


live well,
  vagrant
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