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Diffstat (limited to 'docs/plat/imx8m.rst')
| -rw-r--r-- | docs/plat/imx8m.rst | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/docs/plat/imx8m.rst b/docs/plat/imx8m.rst index f184b6990..0fe15c95a 100644 --- a/docs/plat/imx8m.rst +++ b/docs/plat/imx8m.rst @@ -6,6 +6,9 @@ cores provide high-performance computing, power efficiency, enhanced system reliability and embedded security needed to drive the growth of fast-growing edge node computing, streaming multimedia, and machine learning applications. +imx8mq is dropped in TF-A CI build due to the small OCRAM size, but still actively +maintained in NXP official release. + Boot Sequence ------------- @@ -43,3 +46,17 @@ together to generate a binary file called flash.bin, the imx-mkimage tool is used to generate flash.bin, and flash.bin needs to be flashed into SD card with certain offset for BOOT ROM. the u-boot and imx-mkimage will be upstreamed soon, this doc will be updated once they are ready, and the link will be posted. + +TBBR Boot Sequence +------------------ + +When setting NEED_BL2=1 on imx8mm. We support an alternative way of +boot sequence to support TBBR. + +Bootrom --> SPL --> BL2 --> BL31 --> BL33(u-boot with UEFI) --> grub + +This helps us to fulfill the SystemReady EBBR standard. +BL2 will be in the FIT image and SPL will verify it. +All of the BL3x will be put in the FIP image. BL2 will verify them. +In U-boot we turn on the UEFI secure boot features so it can verify +grub. And we use grub to verify linux kernel. |