mirror of https://gitee.com/openkylin/linux.git
54 lines
2.5 KiB
Plaintext
54 lines
2.5 KiB
Plaintext
Interface between kernel and boot loaders on Exynos boards
|
|
==========================================================
|
|
|
|
Author: Krzysztof Kozlowski
|
|
Date : 6 June 2015
|
|
|
|
The document tries to describe currently used interface between Linux kernel
|
|
and boot loaders on Samsung Exynos based boards. This is not a definition
|
|
of interface but rather a description of existing state, a reference
|
|
for information purpose only.
|
|
|
|
In the document "boot loader" means any of following: U-boot, proprietary
|
|
SBOOT or any other firmware for ARMv7 and ARMv8 initializing the board before
|
|
executing kernel.
|
|
|
|
|
|
1. Non-Secure mode
|
|
Address: sysram_ns_base_addr
|
|
Offset Value Purpose
|
|
=============================================================================
|
|
0x08 exynos_cpu_resume_ns 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
|
|
0x20 0xfcba0d10 (Magic cookie) AFTR
|
|
0x24 exynos_cpu_resume_ns AFTR
|
|
0x28 + 4*cpu 0x8 (Magic cookie, Exynos3250) AFTR
|
|
|
|
|
|
2. Secure mode
|
|
Address: sysram_base_addr
|
|
Offset Value Purpose
|
|
=============================================================================
|
|
0x00 exynos4_secondary_startup Secondary CPU boot
|
|
0x04 exynos4_secondary_startup (Exynos542x) Secondary CPU boot
|
|
4*cpu exynos4_secondary_startup (Exynos4412) Secondary CPU boot
|
|
0x20 exynos_cpu_resume (Exynos4210 r1.0) AFTR
|
|
0x24 0xfcba0d10 (Magic cookie, Exynos4210 r1.0) AFTR
|
|
|
|
Address: pmu_base_addr
|
|
Offset Value Purpose
|
|
=============================================================================
|
|
0x0800 exynos_cpu_resume AFTR
|
|
0x0814 exynos4_secondary_startup (Exynos4210 r1.1) Secondary CPU boot
|
|
0x0818 0xfcba0d10 (Magic cookie, Exynos4210 r1.1) AFTR
|
|
0x081C exynos_cpu_resume (Exynos4210 r1.1) AFTR
|
|
|
|
|
|
3. Other (regardless of secure/non-secure mode)
|
|
Address: pmu_base_addr
|
|
Offset Value Purpose
|
|
=============================================================================
|
|
0x0908 Non-zero (only Exynos3250) Secondary CPU boot up indicator
|