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Struct ast_dramstruct contains a 16-bit index field that either contains a magic value or serves as index into the P2A address segment at 0x1e600000. This segment serves MCR and SCU registers, which the ast_dramstruct programs. It's fragile and relies upon the ast_post_chip_*() functions to set up the segment correctly. Replace the 16-bit index with a full 32-bit address of the SCU and MCR addresses. Initialize the DRAM tables with full register constants and write them out with ast_moutdwm(). This sets the correct segment on each write. Drop __AST_DRAMSTRUCT_DRAM_TYPE as it simply referred to MCR04. Use the latter for initializing the DRAM tables. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patch.msgid.link/20260327133532.79696-10-tzimmermann@suse.de