diff options
| author | Furquan Shaikh <furquan@google.com> | 2021-08-25 15:49:22 -0700 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2021-08-27 15:58:42 +0000 |
| commit | ba936ce5db819d5ecb34e83a998b2390ecbdc4b9 (patch) | |
| tree | 2a9f5c3e962bdc0cc45377db3a6904462558c0a5 /src/soc/intel/denverton_ns | |
| parent | c398a204b40f6a9ccb06cb9b6af67ad528638a05 (diff) | |
soc/intel/denverton_ns: Ensure CPU device has a valid link
This change calls `add_more_links()` in `denverton_init_cpus()` if
`dev->link_list` is NULL. This condition can occur if mainboard does
not add any APIC device in the device tree.
Link: https://mail.coreboot.org/hyperkitty/list/coreboot@coreboot.org/thread/YLMK2FBWWL6RKDNKBVZB3NJDYMEYHED7/
"A different lapic number in devicetree.cb needed for CPU with the
same SKU and steping (Intel Atom C3538)."
Change-Id: I6f453901b17f7eff22beed8dbf6995cdc9f9b776
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57152
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: King Sumo <kingsumos@gmail.com>
Reviewed-by: Suresh Bellampalli <suresh.bellampalli@intel.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Mariusz Szafrański <mariuszx.szafranski@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/soc/intel/denverton_ns')
| -rw-r--r-- | src/soc/intel/denverton_ns/cpu.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/soc/intel/denverton_ns/cpu.c b/src/soc/intel/denverton_ns/cpu.c index 1dc0830d86..10e79be3b5 100644 --- a/src/soc/intel/denverton_ns/cpu.c +++ b/src/soc/intel/denverton_ns/cpu.c @@ -287,6 +287,14 @@ static const struct mp_ops mp_ops = { void denverton_init_cpus(struct device *dev) { + /* + * Ensure there is at least one bus downstream to the CPU device. If not, then create a + * new link. This can occur if the mainboard does not add any APIC device in the device + * tree. + */ + if (!dev->link_list) + add_more_links(dev, 1); + /* Clear for take-off */ if (mp_init_with_smm(dev->link_list, &mp_ops) < 0) printk(BIOS_ERR, "MP initialization failure.\n"); |