Document SRC_GPR10 PERSIST_SECONDARY_BOOT functionality. This is useful for reliable bootloader A/B updates, as it permits switching between two copies of bootloader at different offsets of the same storage. The switch happens in case one copy is corrupted OR can be enforced by user. This functionality is present at least since i.MX53, however is poorly documented in all known SoC datasheets, hence this document aims to clarify the usage, currently on i.MX7D and i.MX8MM. Signed-off-by: Marek Vasut marex@denx.de # Original MX7D work, this document Signed-off-by: Igor Opaniuk igor.opaniuk@foundries.io # All the MX8M work Cc: Christoph Niedermaier cniedermaier@dh-electronics.de Cc: Fabio Estevam festevam@gmail.com Cc: Harald Seiler hws@denx.de Cc: Igor Opaniuk igor.opaniuk@foundries.io Cc: Jan Kiszka jan.kiszka@siemens.com Cc: Ludwig Zenz lzenz@dh-electronics.com Cc: Marcel Ziswiler marcel.ziswiler@toradex.com Cc: Peng Fan peng.fan@nxp.com Cc: Stefano Babic sbabic@denx.de Cc: Ye Li ye.li@nxp.com Cc: uboot-imx uboot-imx@nxp.com Reviewed-by: Peng Fan peng.fan@nxp.com
Applied to u-boot-imx, master, thanks !
Best regards, Stefano Babic