diff options
Diffstat (limited to 'src/mainboard/amd/pistachio')
| -rw-r--r-- | src/mainboard/amd/pistachio/cache_as_ram_auto.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/src/mainboard/amd/pistachio/cache_as_ram_auto.c b/src/mainboard/amd/pistachio/cache_as_ram_auto.c index 52b5c0400a..c348a61f9d 100644 --- a/src/mainboard/amd/pistachio/cache_as_ram_auto.c +++ b/src/mainboard/amd/pistachio/cache_as_ram_auto.c @@ -155,6 +155,7 @@ void real_main(unsigned long bist, unsigned long cpu_init_detectedx) int needs_reset = 0; u32 bsp_apicid = 0; msr_t msr; + struct cpuid_result cpuid1; struct sys_info *sysinfo = (struct sys_info *)(DCACHE_RAM_BASE + DCACHE_RAM_SIZE - DCACHE_RAM_GLOBAL_VAR_SIZE); @@ -198,16 +199,26 @@ void real_main(unsigned long bist, unsigned long cpu_init_detectedx) post_code(0x04); - msr = rdmsr(0xc0010042); - printk_debug("begin msr fid, vid: hi=0x%x, lo=0x%x\n", msr.hi, msr.lo); + /* Check to see if processor is capable of changing FIDVID */ + /* otherwise it will throw a GP# when reading FIDVID_STATUS */ + cpuid1 = cpuid(0x80000007); + if( (cpuid1.edx & 0x6) == 0x6 ) { - enable_fid_change(); - enable_fid_change_on_sb(sysinfo->sbbusn, sysinfo->sbdn); - init_fidvid_bsp(bsp_apicid); + /* Read FIDVID_STATUS */ + msr=rdmsr(0xc0010042); + printk_debug("begin msr fid, vid: hi=0x%x, lo=0x%x\n", msr.hi, msr.lo); - // show final fid and vid - msr = rdmsr(0xc0010042); - printk_debug("end msr fid, vid: hi=0x%x, lo=0x%x\n", msr.hi, msr.lo); + enable_fid_change(); + enable_fid_change_on_sb(sysinfo->sbbusn, sysinfo->sbdn); + init_fidvid_bsp(bsp_apicid); + + /* show final fid and vid */ + msr=rdmsr(0xc0010042); + printk_debug("end msr fid, vid: hi=0x%x, lo=0x%x\n", msr.hi, msr.lo); + + } else { + printk_debug("Changing FIDVID not supported\n"); + } post_code(0x05); |