Add instructions for flashing eMMC with bootloader images from SD.

Signed-off-by: Aswath Govindraju a-govindraju@ti.com --- board/ti/j721e/README | 59 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+)

diff --git a/board/ti/j721e/README b/board/ti/j721e/README index c33afa496e7d..edb26c38ae01 100644 --- a/board/ti/j721e/README +++ b/board/ti/j721e/README @@ -226,6 +226,65 @@ Image formats: | +-------------------+ | +-----------------------+

+eMMC: +----- +ROM supports booting from eMMC from boot0 partition offset 0x0 + +Flashing images to eMMC: + +The following commands can be used to download tiboot3.bin, tispl.bin, +u-boot.img, and sysfw.itb from an SD card and write them to the eMMC boot0 +partition at respective addresses. + +=> mmc dev 0 1 +=> fatload mmc 1 ${loadaddr} tiboot3.bin +=> mmc write ${loadaddr} 0x0 0x400 +=> fatload mmc 1 ${loadaddr} tispl.bin +=> mmc write ${loadaddr} 0x400 0x1000 +=> fatload mmc 1 ${loadaddr} u-boot.img +=> mmc write ${loadaddr} 0x1400 0x2000 +=> fatload mmc 1 ${loadaddr} sysfw.itb +=> mmc write ${loadaddr} 0x3600 0x800 + +To give the ROM access to the boot partition, the following command must be +used for the first time: + +=> mmc partconf 0 1 1 1 + +To set bus width, reset bus width and data rate during boot, the following +command must be used for the first time: + +=> mmc bootbus 0 2 0 0 + +To create a software partition for the rootfs, the following command can be +used: + +=> gpt write mmc 0 ${partitions} + +eMMC layout: + + boot0 partition (8 MB) user partition + 0x0+----------------------------------+ 0x0+-------------------------+ + | tiboot3.bin (512 KB) | | | + 0x400+----------------------------------+ | | + | tispl.bin (2 MB) | | | +0x1400+----------------------------------+ | rootfs | + | u-boot.img (4 MB) | | | +0x3400+----------------------------------+ | | + | environment (128 KB) | | | +0x3500+----------------------------------+ | | + | backup environment (128 KB) | | | +0x3600+----------------------------------+ | | + | sysfw (1 MB) | | | +0x3E00+----------------------------------+ +-------------------------+ + +Kernel image and DT are expected to be present in the /boot folder of rootfs. +To boot kernel from eMMC, use the following commands: + +=> setenv mmcdev 0 +=> setenv bootpart 0 +=> boot + OSPI: ----- ROM supports booting from OSPI from offset 0x0.