Add documentation for loading firmwares to be used by remote cores in the system including the environment variables that has to be set to load the firmwares.
Signed-off-by: Kishon Vijay Abraham I kishon@ti.com --- doc/board/ti/j721e_evm.rst | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/doc/board/ti/j721e_evm.rst b/doc/board/ti/j721e_evm.rst index d0cf7c23f8..89bb46654c 100644 --- a/doc/board/ti/j721e_evm.rst +++ b/doc/board/ti/j721e_evm.rst @@ -314,3 +314,18 @@ Flash layout for OSPI: | ospi.rootfs(UBIFS) | | | +----------------------------+ + +Firmwares: +---------- + +The J721e u-boot allows firmware to be loaded for the Cortex-R5 subsystem. +The CPSW5G in J7200 and CPSW9G in J721E present in MAIN domain is configured +and controlled by the ethernet firmware that executes in the MAIN Cortex R5. +The default supported environment variables support loading these firmwares +from only MMC. "dorprocboot" env variable has to be set for the U-BOOT to load +and start the remote cores in the system. + +J721E common processor board can be attached to a Ethernet QSGMII card and the +PHY in the card has to be reset before it can be used for data transfer. +"do_main_cpsw0_qsgmii_phyinit" env variable has to be set for the U-BOOT to +configure this PHY.