From b07c1c88edd3753b8c10ef13b3c6daf78ab88b3f Mon Sep 17 00:00:00 2001 From: Ahmad Fatoum Date: Sun, 20 Feb 2022 13:47:19 +0100 Subject: ARM: stm32mp: build extra barebox-stm32mp-generic-bl33.img barebox-dt-2nd.img expects being loaded at an offset, so the stack can grow down from entry point. The STM32MP TF-A default is to not have an offset. Avoid this issue by having a stm32mp specific entry point that sets up a 64 byte stack after end of barebox. As it's stm32mp-specific anyway, we can skip the early FDT parsing and ask the SDRAM controller about RAM size. Signed-off-by: Ahmad Fatoum Link: https://lore.barebox.org/20220220124736.3052502-8-a.fatoum@pengutronix.de Signed-off-by: Sascha Hauer --- Documentation/boards/stm32mp.rst | 51 ++++++++++++++++++++++++++++++++++------ 1 file changed, 44 insertions(+), 7 deletions(-) (limited to 'Documentation') diff --git a/Documentation/boards/stm32mp.rst b/Documentation/boards/stm32mp.rst index 2b9dc01b55..55bdafe785 100644 --- a/Documentation/boards/stm32mp.rst +++ b/Documentation/boards/stm32mp.rst @@ -13,20 +13,26 @@ then the second stage boot loader (SSBL) is loaded into DRAM. When building barebox, the resulting ``barebox-${board}.stm32`` file has the STM32 header preprended, so it can be loaded directly as SSBL by the ARM TF-A (https://github.com/ARM-software/arm-trusted-firmware). Each entry point has a -header-less image ending in ``*.pblb`` as well. +header-less image ending in ``*.pblb`` as well. Additionally, there is +a ``barebox-stm32mp-generic.img``, which is a header-less image for +use as part of a Firmware Image Package (FIP). -Use of barebox as FSBL is not supported. +barebox images are meant to be loaded by the ARM TF-A +(https://github.com/ARM-software/arm-trusted-firmware). FIP images are +mandatory for STM32MP1 since TF-A v2.7. + +Use of barebox as FSBL is not implemented. Building barebox ---------------- -With multi-image and device trees, it's expected to have ``stm32mp_defconfig`` -as sole defconfig for all STM32MP boards:: +There's a single ``stm32mp_defconfig`` for all STM32MP boards:: make ARCH=arm stm32mp_defconfig The resulting images will be placed under ``images/``:: + barebox-stm32mp-generic-bl33.img barebox-stm32mp15xx-dkx.stm32 barebox-stm32mp15x-ev1.stm32 barebox-stm32mp157c-lxa-mc1.stm32 @@ -37,13 +43,44 @@ The resulting images will be placed under ``images/``:: barebox-dt-2nd.img In the above output, images with a ``.stm32`` extension feature the (legacy) -stm32image header. ``barebox-dt-2nd.img`` is a generic barebox image that -received an external device tree. +stm32image header. ``barebox-dt-2nd.img`` and ``barebox-stm32mp-generic-bl33.img`` +are board-generic barebox images that receive an external device tree. + +Flashing barebox (FIP) +---------------------- + +After building barebox in ``$BAREBOX_BUILDDIR``, change directory to ARM +Trusted Firmware to build a FIP image. Example building STM32MP157C-DK2 +with SP_min (no OP-TEE): + +.. code:: bash + + make CROSS_COMPILE=arm-none-eabi- PLAT=stm32mp1 ARCH=aarch32 ARM_ARCH_MAJOR=7 \ + STM32MP_EMMC=1 STM32MP_EMMC_BOOT=1 STM32MP_SDMMC=1 STM32MP_SPI_NOR=1 \ + AARCH32_SP=sp_min \ + DTB_FILE_NAME=stm32mp157c-dk2.dtb \ + BL33=$BAREBOX_BUILDDIR/images/barebox-stm32mp-generic-bl33.img \ + BL33_CFG=$BAREBOX_BUILDDIR/arch/arm/dts/stm32mp157c-dk2.dtb \ + fip + +For different boards, adjust ``DTB_FILENAME`` and ``BL33_CFG`` as appropriate. + +If OP-TEE is used, ensure ``CONFIG_OPTEE_SIZE`` is set appropriately, so +early barebox code does not attempt accessing secure memory. + +barebox can also be patched into an existing FIP image with ``fiptool``: + +.. code:: bash + + fiptool update mmcblk0p3 \ + --nt-fw $BAREBOX_BUILDDIR/images/barebox-stm32mp-generic-bl33.img \ + --hw-config $BAREBOX_BUILDDIR/arch/arm/dts/stm32mp135f-dk.dtb Flashing barebox (legacy stm32image) ------------------------------------ -An appropriate image for a SD-Card can be generated with following +After building ARM Trusted Firmware with ``STM32MP_USE_STM32IMAGE=1``, +an appropriate image for a SD-Card can be generated with following ``genimage(1)`` config:: image @STM32MP_BOARD@.img { -- cgit v1.2.3