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 bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jYqtU-0006Cs-Pa for barebox@lists.infradead.org; Wed, 13 May 2020 12:53:54 +0000 From: Ahmad Fatoum Date: Wed, 13 May 2020 14:53:48 +0200 Message-Id: <20200513125348.6266-1-a.fatoum@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 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 --- Documentation/boards/stm32mp.rst | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/Documentation/boards/stm32mp.rst b/Documentation/boards/stm32mp.rst index 607c59fd0757..fc8a68cf4142 100644 --- a/Documentation/boards/stm32mp.rst +++ b/Documentation/boards/stm32mp.rst @@ -63,7 +63,7 @@ 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 { @@ -79,6 +79,14 @@ 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 and to select a boot partition, e.g.:: + + mmcX.boot_ack=1 + mmcX.boot=boot0 + +The STM32MP1 BootROM does *not* support booting eMMC without fast boot acknowledge. + Boot source selection --------------------- -- 2.26.2 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox