From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marek Vasut Date: Tue, 03 May 2016 13:04:25 +0200 Subject: [U-Boot] ARM: sama5d2: Implement boot device autodetection In-Reply-To: <20160503085211.GH6652@punisher.entwicklung.er.corscience.de> References: <1461354981-7117-1-git-send-email-marex@denx.de> <20160503085211.GH6652@punisher.entwicklung.er.corscience.de> Message-ID: <572885B9.3080401@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.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 >> Cc: Andreas Bie?mann >> Cc: Wenyou Yang >> > > Reviewed-by: Andreas Bie?mann 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