[U-Boot] ARM: sama5d2: Implement boot device autodetection

[Marek Vasut]

On 05/03/2016 01:43 PM, Andreas Bießmann wrote:
> Hi Marek,
> 
> On 2016-05-03 13:04, Marek Vasut wrote:
>> On 05/03/2016 10:52 AM, Andreas Bießmann wrote:
>>> On Fri, Apr 22, 2016 at 09:56:21PM +0200, Marek Vasut wrote:
>>>> Implement support for saving ARM register R4 early during boot using
>>>> save_boot_params . Implement support for decoding the stored register
>>>> R4 value in spl_boot_device() to obtain boot device from which the
>>>> SoC booted. This way, the SPL will always load U-Boot from the same
>>>> device from which the SPL itself booted instead of using hard-coded
>>>> boot device.
>>>>
>>>> This functionality is useful for example when booting sama5d2-xplained
>>>> from SD card, where by default the SPL would try loading the U-Boot
>>>> from eMMC and fail. This is because eMMC is on SDHCI0
>>>> (BOOT_DEVICE_MMC1),
>>>> while SD slot is on SDHCI1 (BOOT_DEVICE_MMC2) and the SPL was
>>>> hard-wired
>>>> to always boot from BOOT_DEVICE_MMC1.
>>>>
>>>> Signed-off-by: Marek Vasut <marex at denx.de>
>>>> Cc: Andreas Bießmann <andreas.devel at googlemail.com>
>>>> Cc: Wenyou Yang <wenyou.yang at atmel.com>
>>>>
>>>
>>> Reviewed-by: Andreas Bießmann <andreas at biessmann.org>
>>
>> I will eventually extend this to SAMA5Dx as this is quite helpful on
>> upcoming board.
> 
> Let's do it for the next release. Hopefully this gets in with 2016.05
> ... as always I'm really late for my pull request.

This one is for next release (2016.07) too :) But it's not like it
breaks anything, so this release is fine as well.

> Andreas
> 
>>
>>>> ---
>>>>  arch/arm/mach-at91/Makefile               |  2 +-
>>>>  arch/arm/mach-at91/bootparams_atmel.S     | 18 ++++++++++++++++
>>>>  arch/arm/mach-at91/include/mach/sama5d2.h | 12 +++++++++++
>>>>  arch/arm/mach-at91/spl.c                  | 36
>>>> +++++++++++++++++++++++++++++++
>>>>  4 files changed, 67 insertions(+), 1 deletion(-)
>>>>  create mode 100644 arch/arm/mach-at91/bootparams_atmel.S


-- 
Best regards,
Marek Vasut