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Diffstat (limited to 'docs/porting-guide.md')
| -rw-r--r-- | docs/porting-guide.md | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/docs/porting-guide.md b/docs/porting-guide.md index 82bed6b0..6c6122ad 100644 --- a/docs/porting-guide.md +++ b/docs/porting-guide.md @@ -459,7 +459,7 @@ type of reset nor to query the warm reset entrypoint. Therefore, implementing this function is not required on such platforms. -### Function : plat_secondary_cold_boot_setup() [mandatory] +### Function : plat_secondary_cold_boot_setup() [mandatory when COLD_BOOT_SINGLE_CPU == 0] Argument : void @@ -476,8 +476,12 @@ populated. This function fulfills requirement 2 above. +Note that for platforms that can't release secondary CPUs out of reset, only the +primary CPU will execute the cold boot code. Therefore, implementing this +function is not required on such platforms. -### Function : plat_is_my_cpu_primary() [mandatory] + +### Function : plat_is_my_cpu_primary() [mandatory when COLD_BOOT_SINGLE_CPU == 0] Argument : void Return : unsigned int @@ -487,6 +491,11 @@ secondary CPU. A return value of zero indicates that the CPU is not the primary CPU, while a non-zero return value indicates that the CPU is the primary CPU. +Note that for platforms that can't release secondary CPUs out of reset, only the +primary CPU will execute the cold boot code. Therefore, there is no need to +distinguish between primary and secondary CPUs and implementing this function is +not required. + ### Function : platform_mem_init() [mandatory] |