[S] Change in coreboot[master]: xeon/spr: Set ACPI CPU string for 12bit

[Patrick Rudolph (Code Review)]

Attention is currently required from: Jonathan Zhang, Johnny Lin, Christian Walter, Arthur Heymans, Tim Chu.

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/73368 )

Change subject: xeon/spr: Set ACPI CPU string for 12bit
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xeon/spr: Set ACPI CPU string for 12bit

On platforms with more than 255 cores the ACPI CPU string
would overflow and generate duplicates. Fix that by changing
the string to hex and use 3 digits.

Test:
Able to boot without ACPI errors on IBM/SBP1 which has
384 actives cores.

Change-Id: I1887928da0c049c27e2ec129f49051b24048b33b
Signed-off-by: Naresh Solanki 
---
M src/soc/intel/xeon_sp/spr/Kconfig
1 file changed, 22 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/68/73368/1

diff --git a/src/soc/intel/xeon_sp/spr/Kconfig b/src/soc/intel/xeon_sp/spr/Kconfig
index 899f5ae..7aa1fec 100644
--- a/src/soc/intel/xeon_sp/spr/Kconfig
+++ b/src/soc/intel/xeon_sp/spr/Kconfig
@@ -22,6 +22,10 @@
    int
    default 255

+config ACPI_CPU_STRING
+	string
+	default "\_SB.C%03X"
+
 config MAX_SOCKET_UPD
    int
    default 2