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CSS: Clarify what the SCP boot config is

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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
This commit is contained in:
Sandrine Bailleux 2015-04-29 13:02:46 +01:00
parent de975e85ff
commit 9255da5f63
1 changed files with 11 additions and 2 deletions
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13
include/plat/arm/css/common/css_def.h
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@ -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