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| author | Ahmad Fatoum <ahmad@a3f.at> | 2019-10-30 10:27:31 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2019-11-06 11:22:36 +0100 |
| commit | d510bd6e5746dcba23c11fd03494c2f9114e0ac7 (patch) | |
| tree | a83ac5a4f3a1dc0501d813ba3c08fd16c134a53a /Documentation | |
| parent | cc5c3ad060a219cb8c2964946f1bae67f712e262 (diff) | |
| download | barebox-d510bd6e5746dcba23c11fd03494c2f9114e0ac7.tar.gz barebox-d510bd6e5746dcba23c11fd03494c2f9114e0ac7.tar.xz | |
Documentation: boards: stm32mp: document boot mode strap pins
The evaluation kits have 2P DIP-Switches for boot mode selection.
Document them.
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/boards/stm32mp.rst | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/boards/stm32mp.rst b/Documentation/boards/stm32mp.rst index d4429aae27..f93ec04eb0 100644 --- a/Documentation/boards/stm32mp.rst +++ b/Documentation/boards/stm32mp.rst @@ -62,3 +62,22 @@ An appropriate image for the boot media can be generated with following } Image can then be flashed on e.g. a SD-Card. + +Boot source selection +--------------------- + +The STM32MP BootROM samples three boot pins at reset. Usually BOOT1 is +pulled down and BOOT0 and BOOT2 are connected to a 2P DIP switch:: + + +-------+ + BOOT2 | O O-- | + BOOT0 | N O-- | <---- SDMMC + +-------+ + +-------+ + BOOT2 | O O-- | + BOOT0 | N --O | <---- QSPI-NOR Flash + +-------+ + +-------+ + BOOT2 | O --O | + BOOT0 | N --O | <---- DFU on UART and USB OTG + +-------+ |