Based on kernel version 4.16.1. Page generated on 2018-04-09 11:52 EST.
1 Interface between kernel and boot loaders on Exynos boards 2 ========================================================== 3 4 Author: Krzysztof Kozlowski 5 Date : 6 June 2015 6 7 The document tries to describe currently used interface between Linux kernel 8 and boot loaders on Samsung Exynos based boards. This is not a definition 9 of interface but rather a description of existing state, a reference 10 for information purpose only. 11 12 In the document "boot loader" means any of following: U-boot, proprietary 13 SBOOT or any other firmware for ARMv7 and ARMv8 initializing the board before 14 executing kernel. 15 16 17 1. Non-Secure mode 18 19 Address: sysram_ns_base_addr 20 Offset Value Purpose 21 ============================================================================= 22 0x08 exynos_cpu_resume_ns, mcpm_entry_point System suspend 23 0x0c 0x00000bad (Magic cookie) System suspend 24 0x1c exynos4_secondary_startup Secondary CPU boot 25 0x1c + 4*cpu exynos4_secondary_startup (Exynos4412) Secondary CPU boot 26 0x20 0xfcba0d10 (Magic cookie) AFTR 27 0x24 exynos_cpu_resume_ns AFTR 28 0x28 + 4*cpu 0x8 (Magic cookie, Exynos3250) AFTR 29 30 31 2. Secure mode 32 33 Address: sysram_base_addr 34 Offset Value Purpose 35 ============================================================================= 36 0x00 exynos4_secondary_startup Secondary CPU boot 37 0x04 exynos4_secondary_startup (Exynos542x) Secondary CPU boot 38 4*cpu exynos4_secondary_startup (Exynos4412) Secondary CPU boot 39 0x20 exynos_cpu_resume (Exynos4210 r1.0) AFTR 40 0x24 0xfcba0d10 (Magic cookie, Exynos4210 r1.0) AFTR 41 42 Address: pmu_base_addr 43 Offset Value Purpose 44 ============================================================================= 45 0x0800 exynos_cpu_resume AFTR, suspend 46 0x0800 mcpm_entry_point (Exynos542x with MCPM) AFTR, suspend 47 0x0804 0xfcba0d10 (Magic cookie) AFTR 48 0x0804 0x00000bad (Magic cookie) System suspend 49 0x0814 exynos4_secondary_startup (Exynos4210 r1.1) Secondary CPU boot 50 0x0818 0xfcba0d10 (Magic cookie, Exynos4210 r1.1) AFTR 51 0x081C exynos_cpu_resume (Exynos4210 r1.1) AFTR 52 53 54 3. Other (regardless of secure/non-secure mode) 55 56 Address: pmu_base_addr 57 Offset Value Purpose 58 ============================================================================= 59 0x0908 Non-zero Secondary CPU boot up indicator 60 on Exynos3250 and Exynos542x 61 62 63 4. Glossary 64 65 AFTR - ARM Off Top Running, a low power mode, Cortex cores and many other 66 modules are power gated, except the TOP modules 67 MCPM - Multi-Cluster Power Management