diff options
| -rw-r--r-- | src/soc/intel/common/block/cpu/mp_init.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/src/soc/intel/common/block/cpu/mp_init.c b/src/soc/intel/common/block/cpu/mp_init.c index c31a6f70b7..bf47b2e0b2 100644 --- a/src/soc/intel/common/block/cpu/mp_init.c +++ b/src/soc/intel/common/block/cpu/mp_init.c @@ -115,14 +115,25 @@ void get_microcode_info(const void **microcode, int *parallel) * this call if user has selected USE_INTEL_FSP_MP_INIT). * 2. coreboot would like to take APs control back after FSP-S has done with MP * initialization based on user select USE_INTEL_FSP_MP_INIT. + * + * This function would use cpu_cluster as a device and APIC device as a linked list to + * the cpu cluster. This function adds a node in case the mainboard doesn't have a lapic id + * hardcoded in devicetree, and then fills with the actual BSP APIC ID. + * This allows coreboot to dynamically detect the LAPIC ID of BSP. + * In case the mainboard has an APIC ID defined in devicetree, a link will be present and + * creation of the new node will be skipped. This node will have the APIC ID defined + * in devicetree. */ void init_cpus(void) { struct device *dev = dev_find_path(NULL, DEVICE_PATH_CPU_CLUSTER); assert(dev != NULL); - if (dev && dev->link_list) - soc_init_cpus(dev->link_list); + /* In case link to APIC device is not found, create the one */ + if (!dev->link_list) + add_more_links(dev, 1); + + soc_init_cpus(dev->link_list); } static void coreboot_init_cpus(void *unused) |