armv7R: K3: j721e: Add support for boot device detection
J721E allows for booting from primary or backup boot media. Both media can be chosen individually based on switch settings. ROM looks for a valid image in primary boot media, if not found then looks in backup boot media. In order to pass this boot media information to boot loader, ROM stores a value at a particular address. Add support for reading this information and determining the boot media correctly. Signed-off-by: NLokesh Vutla <lokeshvutla@ti.com> Signed-off-by: NAndreas Dannenberg <dannenberg@ti.com> Signed-off-by: NFaiz Abbas <faiz_abbas@ti.com>
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