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@denx.de Cc: Andreas Bießmann andreas.devel@googlemail.com Cc: Wenyou Yang wenyou.yang@atmel.com
Reviewed-by: Andreas Bießmann andreas@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