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soc/intel/xeon_sp/spr: Add soc set_cmos_mrc_cold_boot_flag 

This soc utility function can set cmos flag to enforce
FSP MRC training.

Change-Id: I88004cbfdcbe8870726493576dfc31de4b6036a9
Signed-off-by: Johnny Lin <johnny_lin@wiwynn.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72598
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
This commit is contained in:
Johnny Lin 2023-01-30 20:44:05 +08:00 committed by Lean Sheng Tan
parent d5bd8d54a3
commit a0b199c6b4
2 changed files with 28 additions and 1 deletions
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17
src/soc/intel/xeon_sp/spr/include/soc/soc_util.h
View File

@ -9,6 +9,22 @@
#include <hob_systeminfo.h>
#include <hob_enhancedwarningloglib.h>
/*
* Address of the MRC status byte in CMOS. Should be reserved
* in mainboards' cmos.layout and not covered by checksum.
*/
#define CMOS_OFFSET_MRC_STATUS 0x47
#if CONFIG(USE_OPTION_TABLE)
#include "option_table.h"
#if CMOS_VSTART_mrc_status != CMOS_OFFSET_MRC_STATUS * 8
#error "CMOS start for CPX-SP MRC status byte is not correct, check your cmos.layout"
#endif
#if CMOS_VLEN_mrc_status != 8
#error "CMOS length for CPX-SP MRC status byte is not correct, check your cmos.layout"
#endif
#endif
const struct SystemMemoryMapHob *get_system_memory_map(void);
const struct SystemMemoryMapElement *get_system_memory_map_elment(uint8_t *num);
@ -28,5 +44,6 @@ const EWL_PRIVATE_DATA *get_ewl_hob(void);
uint32_t get_ubox_busno(uint32_t socket, uint8_t offset);
uint32_t get_socket_ubox_busno(uint32_t socket);
void set_cmos_mrc_cold_boot_flag(bool cold_boot_required);
#endif /* _SOC_UTIL_H_ */

12
src/soc/intel/xeon_sp/spr/soc_util.c
View File

@ -5,7 +5,6 @@
#include <device/pci.h>
#include <hob_cxlnode.h>
#include <intelblocks/cpulib.h>
#include <soc/cpu.h>
#include <soc/msr.h>
#include <soc/numa.h>
#include <soc/pci_devs.h>
@ -13,6 +12,7 @@
#include <soc/util.h>
#include <stdlib.h>
#include <string.h>
#include <pc80/mc146818rtc.h>
const EWL_PRIVATE_DATA *get_ewl_hob(void)
{
@ -161,3 +161,13 @@ void bios_done_msr(void *unused)
wrmsr(MSR_BIOS_DONE, msr);
}
}
void set_cmos_mrc_cold_boot_flag(bool cold_boot_required)
{
uint8_t mrc_status = cmos_read(CMOS_OFFSET_MRC_STATUS);
uint8_t new_mrc_status = (mrc_status & 0xfe) | cold_boot_required;
printk(BIOS_SPEW, "MRC status: 0x%02x want 0x%02x\n", mrc_status, new_mrc_status);
if (new_mrc_status != mrc_status)
cmos_write(new_mrc_status, CMOS_OFFSET_MRC_STATUS);
}