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* [PATCH] Documentation: boards: stm32mp: document eMMC boot configuration
@ 2020-08-28 17:31 Bastian Krause
  2020-09-14 13:10 ` Sascha Hauer
  0 siblings, 1 reply; 5+ messages in thread
From: Bastian Krause @ 2020-08-28 17:31 UTC (permalink / raw)
  To: barebox; +Cc: Ahmad Fatoum, Bastian Krause

From: Ahmad Fatoum <a.fatoum@pengutronix.de>

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 <a.fatoum@pengutronix.de>
Signed-off-by: Bastian Krause <bst@pengutronix.de>
---
 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


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^ permalink raw reply	[flat|nested] 5+ messages in thread
* [PATCH] Documentation: boards: stm32mp: document eMMC boot configuration
@ 2020-05-13 12:53 Ahmad Fatoum
  2020-05-18  6:36 ` Sascha Hauer
  0 siblings, 1 reply; 5+ messages in thread
From: Ahmad Fatoum @ 2020-05-13 12:53 UTC (permalink / raw)
  To: barebox; +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 <a.fatoum@pengutronix.de>
---
 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


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barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-09-14 13:10 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2020-08-28 17:31 [PATCH] Documentation: boards: stm32mp: document eMMC boot configuration Bastian Krause
2020-09-14 13:10 ` Sascha Hauer
  -- strict thread matches above, loose matches on Subject: below --
2020-05-13 12:53 Ahmad Fatoum
2020-05-18  6:36 ` Sascha Hauer
2020-05-18  9:36   ` Sascha Hauer

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