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ad329e50b6
Adds bl2 with FIP to the build required for mbed Linux booting where we do: BootROM -> SPL -> BL2 -> OPTEE -> u-boot If NEED_BL2 is specified then BL2 will be built and BL31 will have its address range modified upwards to accommodate. BL31 must be loaded from a FIP in this case. If NEED_BL2 is not specified then the current BL31 boot flow is unaffected and u-boot SPL will load and execute BL31 directly. Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Signed-off-by: Ying-Chun Liu (PaulLiu) <paulliu@debian.org> Change-Id: I655343b3b689b1fc57cfbedda4d3dc2fbd549a96
59 lines
1.9 KiB
ReStructuredText
59 lines
1.9 KiB
ReStructuredText
NXP i.MX 8M Series
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==================
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The i.MX 8M family of applications processors based on Arm Corte-A53 and Cortex-M4
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cores provide high-performance computing, power efficiency, enhanced system
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reliability and embedded security needed to drive the growth of fast-growing
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edge node computing, streaming multimedia, and machine learning applications.
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Boot Sequence
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-------------
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Bootrom --> SPL --> BL31 --> BL33(u-boot) --> Linux kernel
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How to build
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------------
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Build Procedure
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~~~~~~~~~~~~~~~
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- Prepare AARCH64 toolchain.
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- Build spl and u-boot firstly, and get binary images: u-boot-spl.bin,
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u-boot-nodtb.bin and dtb for the target board.
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- Build TF-A
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Build bl31:
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.. code:: shell
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CROSS_COMPILE=aarch64-linux-gnu- make PLAT=<Target_SoC> bl31
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Target_SoC should be "imx8mq" for i.MX8MQ SoC.
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Target_SoC should be "imx8mm" for i.MX8MM SoC.
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Target_SoC should be "imx8mn" for i.MX8MN SoC.
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Target_SoC should be "imx8mp" for i.MX8MP SoC.
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Deploy TF-A Images
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~~~~~~~~~~~~~~~~~~
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TF-A binary(bl31.bin), u-boot-spl.bin u-boot-nodtb.bin and dtb are combined
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together to generate a binary file called flash.bin, the imx-mkimage tool is
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used to generate flash.bin, and flash.bin needs to be flashed into SD card
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with certain offset for BOOT ROM. the u-boot and imx-mkimage will be upstreamed
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soon, this doc will be updated once they are ready, and the link will be posted.
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TBBR Boot Sequence
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------------------
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When setting NEED_BL2=1 on imx8mm. We support an alternative way of
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boot sequence to support TBBR.
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Bootrom --> SPL --> BL2 --> BL31 --> BL33(u-boot with UEFI) --> grub
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This helps us to fulfill the SystemReady EBBR standard.
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BL2 will be in the FIT image and SPL will verify it.
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All of the BL3x will be put in the FIP image. BL2 will verify them.
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In U-boot we turn on the UEFI secure boot features so it can verify
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grub. And we use grub to verify linux kernel.
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