Prasad Kummari 5ffab6ee12 xilinx: versal: add firmware access to PMC multi Boot mode register ... Added extended support for retrieving the PMC muti boot mode register via the firmware interface, which is preferred when U-Boot runs in EL2 and cannot directly access PMC registers via raw reads. Ideally, all secure registers should be accessed via xilinx_pm_request(). Introduced the secure zynqmp_pm_get_pmc_multi_boot_reg() call, which uses xilinx_pm_request() to read the PMC multi boot mode register. BootROM increments the MultiBoot register (PMC_MULTI_BOOT) read address offset by 32 KB and retries. For SD and eMMC boot modes, it can search up to 8191 FAT files for the identification string. A 13-bit mask (0x1FFF) is applied to PMC_MULTI_BOOT_MASK to obtain the correct values in BootROM. Signed-off-by: Prasad Kummari <prasad.kummari@amd.com> Link: https://lore.kernel.org/r/20250305134845.3182193-1-prasad.kummari@amd.com Signed-off-by: Michal Simek <michal.simek@amd.com>		2025-04-16 13:42:06 +02:00
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mach	xilinx: versal: add firmware access to PMC multi Boot mode register	2025-04-16 13:42:06 +02:00