diff options
Diffstat (limited to 'src/vendorcode/amd')
| -rw-r--r-- | src/vendorcode/amd/fsp/picasso/platform_descriptors.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/vendorcode/amd/fsp/picasso/platform_descriptors.h b/src/vendorcode/amd/fsp/picasso/platform_descriptors.h index 2faa0abe97..9c0e3e93ac 100644 --- a/src/vendorcode/amd/fsp/picasso/platform_descriptors.h +++ b/src/vendorcode/amd/fsp/picasso/platform_descriptors.h @@ -113,6 +113,32 @@ typedef struct __packed { * Picasso DXIO Descriptor: Used for assigning lanes to PCIe/SATA/XGBE engines, configure * bifurcation and other settings. Beware that the lane numbers in here are the logical and not * the physical lane numbers! + * + * Picasso DXIO lane mapping: + * + * physical | logical | protocol + * ---------|---------|----------- + * GFX[7:0] | [15:8] | PCIe + * GPP[3:0] | [7:4] | PCIe + * GPP[5:4] | [1:0] | PCIe, XGBE + * GPP[7:6] | [3:2] | PCIe, SATA + * + * Dali has less DXIO connectivity than Picasso: + * + * physical | logical | protocol + * ---------|---------|----------- + * GFX[3:0] | [11:8] | PCIe + * GPP[1:0] | [5:4] | PCIe + * GPP[5:4] | [1:0] | PCIe, XGBE + * GPP[7:6] | [3:2] | SATA + * + * Pollock has even less DXIO lanes and the mapping of GPP lane numbers to the logical lane + * numbers differs to Picasso/Dali: + * + * physical | logical | protocol + * ---------|---------|---------- + * GPP[1:0] | [1:0] | PCIe + * GPP[3:2] | [5:4] | PCIe */ typedef struct __packed { uint8_t engine_type; |