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-rw-r--r--src/soc/amd/picasso/Kconfig16
1 files changed, 16 insertions, 0 deletions
diff --git a/src/soc/amd/picasso/Kconfig b/src/soc/amd/picasso/Kconfig
index bae2d2868a..5ae0a2a58f 100644
--- a/src/soc/amd/picasso/Kconfig
+++ b/src/soc/amd/picasso/Kconfig
@@ -535,6 +535,22 @@ config VBOOT_STARTS_BEFORE_BOOTBLOCK
Runs verstage on the PSP. Only available on
certain Chrome OS branded parts from AMD.
+config VBOOT_HASH_BLOCK_SIZE
+ hex
+ default 0x9000
+ depends on VBOOT_STARTS_BEFORE_BOOTBLOCK
+ help
+ Because the bulk of the time in psp_verstage to hash the RO cbfs is
+ spent in the overhead of doing svc calls, increasing the hash block
+ size significantly cuts the verstage hashing time as seen below.
+
+ 4k takes 180ms
+ 16k takes 44ms
+ 32k takes 33.7ms
+ 36k takes 32.5ms
+ There's actually still room for an even bigger stack, but we've
+ reached a point of diminishing returns.
+
config CMOS_RECOVERY_BYTE
hex
default 0x51