• Krzysztof Kozlowski's avatar
    Documentation: EXYNOS: Update bootloader interface on exynos542x · 97d5c7a7
    Krzysztof Kozlowski authored
    Update the documentation about:
    1. Usage of PMU_SPARE2 register.
       Bootloaders on Exynos542x-based boards often use the register
       PMU_SPARE2 (0x908) in the same way as on Exynos3250: as a indicator
       the secondary CPU was booted on. The bootloader will set this value
       to non-zero, after sucessfull power up of secondary CPU. In the same
       time this booted CPU will stuck (spin) waiting for software reset.
    2. Exynos542x entry address for secondary CPU boot up after system
       suspend (with MCPM enabled and in non-secure mode).
    
    See arch/arm/mach-exynos/mcpm-exynos.c for source code.
    Signed-off-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
    Signed-off-by: default avatarKukjin Kim <kgene@kernel.org>
    97d5c7a7
Bootloader-interface.txt 2.99 KB