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authorKrzysztof Kozlowski <k.kozlowski@samsung.com>2015-10-23 22:43:31 +0300
committerKukjin Kim <kgene@kernel.org>2015-10-23 22:43:31 +0300
commit97d5c7a77e39ab96a2a6137de0e35dd6e3f38325 (patch)
tree5620f6b3cc07b1764ca83ead3d5aa91c53066b16 /Documentation/arm
parent4dddfb882373b542d33a98576975237a23c0110c (diff)
downloadlinux-97d5c7a77e39ab96a2a6137de0e35dd6e3f38325.tar.xz
Documentation: EXYNOS: Update bootloader interface on exynos542x
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: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Kukjin Kim <kgene@kernel.org>
Diffstat (limited to 'Documentation/arm')
-rw-r--r--Documentation/arm/Samsung/Bootloader-interface.txt5
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/arm/Samsung/Bootloader-interface.txt b/Documentation/arm/Samsung/Bootloader-interface.txt
index df8d4fb85939..ed494ac0beb2 100644
--- a/Documentation/arm/Samsung/Bootloader-interface.txt
+++ b/Documentation/arm/Samsung/Bootloader-interface.txt
@@ -19,7 +19,7 @@ executing kernel.
Address: sysram_ns_base_addr
Offset Value Purpose
=============================================================================
-0x08 exynos_cpu_resume_ns System suspend
+0x08 exynos_cpu_resume_ns, mcpm_entry_point System suspend
0x0c 0x00000bad (Magic cookie) System suspend
0x1c exynos4_secondary_startup Secondary CPU boot
0x1c + 4*cpu exynos4_secondary_startup (Exynos4412) Secondary CPU boot
@@ -56,7 +56,8 @@ Offset Value Purpose
Address: pmu_base_addr
Offset Value Purpose
=============================================================================
-0x0908 Non-zero (only Exynos3250) Secondary CPU boot up indicator
+0x0908 Non-zero Secondary CPU boot up indicator
+ on Exynos3250 and Exynos542x
4. Glossary