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author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2020-08-28 19:31:15 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-09-14 15:09:46 +0200 |
commit | 156a61d16e3661739749b90bdf5a243f8a26c8dc (patch) | |
tree | b83d86428a041e1e6202fbce37e11ca7005e7cec /Documentation | |
parent | 4669b5eacd48cd9bbb4e1d9d69e64491378b6cfa (diff) | |
download | barebox-156a61d16e3661739749b90bdf5a243f8a26c8dc.tar.gz barebox-156a61d16e3661739749b90bdf5a243f8a26c8dc.tar.xz |
Documentation: boards: stm32mp: document eMMC boot configuration
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>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/boards/stm32mp.rst | 13 |
1 files changed, 12 insertions, 1 deletions
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 --------------------- |