diff options
| author | Shelley Chen <shchen@google.com> | 2022-12-01 13:40:53 -0800 |
|---|---|---|
| committer | Shelley Chen <shchen@google.com> | 2022-12-03 01:04:20 +0000 |
| commit | e233fc7ac1425d54f5f237f6391d00141867836c (patch) | |
| tree | bb7eb8352cbdd76ab8acfd393f98a5a9944a0b69 /src/mainboard/google/herobrine | |
| parent | dddaeed4c142a23b05e68b1af77026bf7f2676e9 (diff) | |
mb/google/herobrine: NVMe id determined by logical (not physical) bit
NVMe is determined by a logical bit 1, not the physical SKU pin.
Thus, (logical) sku_id & 0x2 == 0x2 would mean that the device has
NVMe enabled on it. Previously, I thought that it was tied to a
physical pin, but this is not correct.
BUG=b:254281839
BRANCH=None
TEST=flash and boot on villager and make sure that NVMe is not
initialized in coreboot.
Change-Id: Iaa75d2418d6a2351d874842e8678bd6ad3c92526
Signed-off-by: Shelley Chen <shchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70230
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard/google/herobrine')
| -rw-r--r-- | src/mainboard/google/herobrine/mainboard.c | 20 |
1 files changed, 6 insertions, 14 deletions
diff --git a/src/mainboard/google/herobrine/mainboard.c b/src/mainboard/google/herobrine/mainboard.c index c9bca737e5..8a51b2b1ae 100644 --- a/src/mainboard/google/herobrine/mainboard.c +++ b/src/mainboard/google/herobrine/mainboard.c @@ -85,18 +85,14 @@ static void display_startup(void) } /* - * Determine if board need to perform PCIe initialization. On Herobrine, - * resistor strapping will be such that bit 0 will be assigned 2 (high Z) if it - * is an NVMe enabled platform. + * Determine if board need to perform PCIe initialization. Will return true if + * NVMe initialization is needed, or false if it is an eMMC device. On + * Herobrine, if it is an NVMe enabled platform, logical sku_id & 2 will be + * true. */ bool mainboard_needs_pcie_init(void) { - /* - * Mask out everything above the actual SKU bits We have 3 sku pins, - * each tristate, so we can represent numbers up to 27, or 5 bits - */ - uint32_t sku_bits_mask = 0xff; - uint32_t sku = sku_id() & sku_bits_mask; + uint32_t sku = sku_id(); if (sku == CROS_SKU_UNKNOWN) { printk(BIOS_WARNING, "Unknown SKU (%#x); assuming PCIe", sku); @@ -106,11 +102,7 @@ bool mainboard_needs_pcie_init(void) return true; } - if ((sku % 3) == 2) - return true; - - /* Otherwise, eMMC */ - return false; + return !!(sku & 0x2); } static void mainboard_init(struct device *dev) |