From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kBiDi-0007UR-22 for barebox@lists.infradead.org; Fri, 28 Aug 2020 17:31:22 +0000 From: Bastian Krause Date: Fri, 28 Aug 2020 19:31:15 +0200 Message-Id: <20200828173115.22292-1-bst@pengutronix.de> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH] Documentation: boards: stm32mp: document eMMC boot configuration To: barebox@lists.infradead.org Cc: Ahmad Fatoum , Bastian Krause From: Ahmad Fatoum In order to boot from eMMC on the STM32MP15x, the boot_ack bit in the ext_csd register must be set. Document this and while at it, fix a misformatted code block in the same section. Signed-off-by: Ahmad Fatoum Signed-off-by: Bastian Krause --- Documentation/boards/stm32mp.rst | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/Documentation/boards/stm32mp.rst b/Documentation/boards/stm32mp.rst index 7c657eb990..b235c39927 100644 --- a/Documentation/boards/stm32mp.rst +++ b/Documentation/boards/stm32mp.rst @@ -64,7 +64,7 @@ An appropriate image for a SD-Card can be generated with following } For eMMC, the boot partitions are used as the FSBL partitions and so the user -partitions may look like this: +partitions may look like this:: image @STM32MP_BOARD@.img { partition ssbl { @@ -80,6 +80,17 @@ partitions may look like this: The fsbl1 and fsbl2 can be flashed by writing to barebox ``/dev/mmcX.boot0`` and ``/dev/mmcX.boot1`` respectively or from a booted operating system. +Additionally, the eMMC's ``ext_csd`` register must be modified to activate the +boot acknowledge signal (``BOOT_ACK``) and to select a boot partition. + +Assuming ``CONFIG_CMD_MMC_EXTCSD`` is enabled and the board shall boot from +``/dev/mmc1.boot1``:: + + mmc_extcsd /dev/mmc1 -i 179 -v 0x50 + +The STM32MP1 BootROM does *not* support booting from eMMC without fast boot +acknowledge. + Boot source selection --------------------- -- 2.28.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox