From 9255da5f63065a4a3fdcd115ea0f1047275bab9c Mon Sep 17 00:00:00 2001 From: Sandrine Bailleux Date: Wed, 29 Apr 2015 13:02:46 +0100 Subject: [PATCH] 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 --- include/plat/arm/css/common/css_def.h | 13 +++++++++++-- 1 file 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 056c00df4..12e754133 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