diff options
| author | Sandrine Bailleux <sandrine.bailleux@arm.com> | 2015-04-29 13:02:46 +0100 |
|---|---|---|
| committer | Sandrine Bailleux <sandrine.bailleux@arm.com> | 2015-06-09 11:49:34 +0100 |
| commit | 9255da5f63065a4a3fdcd115ea0f1047275bab9c (patch) | |
| tree | c67ab70d7f9360ff8f42407a8717b4b8d6679d69 /include/plat/arm/css/common | |
| parent | de975e85ff4a3712fc8ff8aa5556e0ec0a11e63c (diff) | |
CSS: Clarify what the SCP boot config is
Add a comment explaining what the SCP boot configuration information
is on CSS based platforms like Juno. Also express its address
relatively to the base of the Trusted SRAM rather than hard-coding it.
Change-Id: I82cf708a284c8b8212933074ea8c37bdf48b403b
Diffstat (limited to 'include/plat/arm/css/common')
| -rw-r--r-- | include/plat/arm/css/common/css_def.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/include/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h index 056c00df..12e75413 100644 --- a/include/plat/arm/css/common/css_def.h +++ b/include/plat/arm/css/common/css_def.h @@ -66,8 +66,17 @@ #define CSS_IRQ_TZC 80 #define CSS_IRQ_TZ_WDOG 86 -/* SCP <=> AP boot configuration */ -#define SCP_BOOT_CFG_ADDR 0x04000080 +/* + * SCP <=> AP boot configuration + * + * The SCP/AP boot configuration is a 32-bit word located at a known offset from + * the start of the Trusted SRAM. Part of this configuration is which CPU is the + * primary, according to the shift and mask definitions below. + * + * Note that the value stored at this address is only valid at boot time, before + * the BL3-0 image is transferred to SCP. + */ +#define SCP_BOOT_CFG_ADDR (ARM_TRUSTED_SRAM_BASE + 0x80) #define PRIMARY_CPU_SHIFT 8 #define PRIMARY_CPU_BIT_WIDTH 4 |