From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] ARM: sama5d2: Implement boot device autodetection
Date: Tue, 03 May 2016 13:04:25 +0200 [thread overview]
Message-ID: <572885B9.3080401@denx.de> (raw)
In-Reply-To: <20160503085211.GH6652@punisher.entwicklung.er.corscience.de>
On 05/03/2016 10:52 AM, Andreas Bie?mann 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@denx.de>
>> Cc: Andreas Bie?mann <andreas.devel@googlemail.com>
>> Cc: Wenyou Yang <wenyou.yang@atmel.com>
>>
>
> Reviewed-by: Andreas Bie?mann <andreas@biessmann.org>
I will eventually extend this to SAMA5Dx as this is quite helpful on
upcoming board.
>> ---
>> 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
next prev parent reply other threads:[~2016-05-03 11:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-22 19:56 [U-Boot] [PATCH] ARM: sama5d2: Implement boot device autodetection Marek Vasut
2016-05-03 8:52 ` [U-Boot] " Andreas Bießmann
2016-05-03 11:04 ` Marek Vasut [this message]
2016-05-03 11:43 ` Andreas Bießmann
2016-05-03 11:47 ` Marek Vasut
-- strict thread matches above, loose matches on Subject: below --
2016-05-03 11:38 [U-Boot] [U-Boot, 1/2] ARM: at91: sama5d2: add macro & field definitions Andreas Bießmann
2016-05-03 11:38 ` [U-Boot] ARM: sama5d2: Implement boot device autodetection Andreas Bießmann
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