[U-Boot] [PATCH v2 0/3] sunxi: support FEL-provided environment vars and "fel" boot target

[Siarhei Siamashka <siarhei.siamashka@gmail.com>]

On Mon, 14 Sep 2015 16:12:25 +0200
Hans de Goede <hdegoede@redhat.com> wrote:

> Hi,
> 
> On 14-09-15 15:15, Bernhard Nortmann wrote:
> > This patch series builds upon
> > http://lists.denx.de/pipermail/u-boot/2015-September/226515.html
> > http://lists.denx.de/pipermail/u-boot/2015-September/226688.html
> >
> > v2 combines the previous submissions, and adds some suggested
> > fixes/changes.
> >
> > The sunxi-tool side of things is discussed here:
> > https://www.mail-archive.com/linux-sunxi at googlegroups.com/msg13071.html
> >
> > * Hans de Goede already pointed out that it might be preferable to
> > make use of the spl_boot_device() function even from the main
> > (non-SPL) U-Boot binary (e.g. for the "NAND" case). Currently this
> > function is only available with CONFIG_SPL_BUILD set, and
> > implemented in arch/arm/cpu/armv7/sunxi/board.c
> > Would it be safe to enable it for non-SPL builds and use something
> > like "(spl_boot_device == BOOT_DEVICE_BOARD)" for misc_init_r()?
> >
> > * Side note: the sunxi spl_boot_device() will probably require
> > some future refinement anyway, to account for the 'oddball' A80.
> > That SoC requires the SPL at a different address (0x10000 instead
> > of 0x0).
> >
> > * The test for FEL boot mode ("eGON.BT0") in spl_boot_device()
> > explicitly uses the "io" function readl() to access the signature.
> > Is there a specific reason for this? Marex pointed out (on IRC)
> > that the SRAM might as well be read directly. For now, I have
> > followed the existing code, and used readl() and readb() to work
> > with the SPL header information.
> >
> > * The check_signature() function somewhat duplicates very similar
> > code from arch/arm/include/asm/io.h. That particular piece of code
> > depends on the presence of a "__mem_pci" symbol. However, it seems
> > 'generic' enough - so it may be worth to factor out and reuse it?
> >
> > Regards, B. Nortmann
> >
> > Changes in v2:
> > - Rename field to fel_script_address, discard fel_data_size
> > - Clearing header fields is no longer needed, as mksunxiboot.c zeroes entire image first
> > - renamed fel_data_addr to fel_script_addr, discarded fel_data_size
> > - make sure that FEL-related environment vars are always cleared first
> > - support minimum and maximum SPL (header) version, more verbose error messages
> > - renamed fel_data_addr to fel_scriptaddr
> > - combined both tests into one as suggested by Hans de Goede
> >
> > Bernhard Nortmann (3):
> >    sunxi: (mksunxiboot) signature to indicate "sunxi" SPL variant
> >    sunxi: retrieve FEL-provided values to environment variables
> >    sunxi: add "fel" boot target
> 
> Thanks, series looks good to me. Siarhei, can I have your Acked-by
> for this series (indicating that you are ok with them from having
> matching changes in sunxi-tools pov) ? Once I've your acked by
> I'll queue this up for merging.

Yes, it also looks good to me after the 'fel_data_size' field has
been dropped.

> Should we target this for v2015.10, or for the next cycle ?
>
> The changes look quite safe to me, so I'm ok with putting this
> on v2015.10, but I wonder what others think.

I don't have any strong opinion about this.

-- 
Best regards,
Siarhei Siamashka