Feature #583
openAllow reconfiguring PCIe slots on Asus P8Z77-V
90%
Description
Vendor firmware allows configuring the PCIe slots in three different ways, by reallocating 4 of the PCIe lanes between PCIEX16_3, PCIEX1_1, PCIEX1_2, and the onboard ASM1061 serial ATA controller providing 2 additional SATA ports. The options are (devices not shown are disabled):
- X4: PCIEX16_3 as x4
- X1: PCIEX16_3 as x1, PCIEX1_1, PCIEX1_2
- Auto: PCIEX16_3 as x1, PCIEX1_1, ASM1061
The technical details have been worked out and implemented as patch CB:85413. However, two issues remain:
- Despite our best efforts, PCIEX1_2 still doesn't work.
- Configuring PCIEX16_3 for 4x requires changing a PCH soft strap from firmware, and coreboot lacks infrastructure for doing so. It has been established that the descriptor itself, which contains the soft straps, needs to be reflashed to make this change.
This issue tracks our progress implementing this feature.
Files
Updated by Bill XIE about 1 month ago
Updated by Bill XIE about 1 month ago
Updated by Keith Hui about 1 month ago
Updated by Bill XIE about 1 month ago
- File p8z77v-r1.02.png p8z77v-r1.02.png added
Updated by Keith Hui about 1 month ago
Attached gimped photo shows where to probe instead. The numbers are for X_QSW_SEL[#].
Updated by Bill XIE 23 days ago
- File p8z77v-ifd.bin p8z77v-ifd.bin added
- File p8z77v-ifdprog.log p8z77v-ifdprog.log added
Keith Hui wrote in #note-7:
IFD reflash process has been determined and implemented. Test underway. A mode where PCIEX16_3 operates in x2, not available with vendor BIOS, is added. Hardware has been tested to be capable of this mode, but PCIEX1_1 will be disabled.
Updated by Bill XIE 22 days ago
- File p8z77v-ifdprog-rdev.log p8z77v-ifdprog-rdev.log added
Updated by Keith Hui 20 days ago
- File 87334-ifd-updated.log 87334-ifd-updated.log added
Boot log of a successful update on p8z77-v_le_plus, being developed under CB:87334.
Updated by Keith Hui 20 days ago
- File inteltool.pciex2.log inteltool.pciex2.log added
- File inteltool.pciex4.log inteltool.pciex4.log added
- File p8z77v-leplus.pcie2x.nonvme.log p8z77v-leplus.pcie2x.nonvme.log added
- File p8z77v-leplus.pcie2x.nvme.log p8z77v-leplus.pcie2x.nvme.log added
- File p8z77v-leplus.pcie4x.nonvme.log p8z77v-leplus.pcie4x.nonvme.log added
- File p8z77v-leplus.pcie4x.nvme.log p8z77v-leplus.pcie4x.nvme.log added
Linux kernel 6.12.7 fails to start with no message on p8z77-v_le_plus if PCIEX16_3 set for x4 without a card installed.
Updated by Bill XIE 18 days ago
- File gma-pid.diff gma-pid.diff added
- File p8z77v-ifdprog-me.log p8z77v-ifdprog-me.log added
IFD programming works under intact ME, but IGD gets disabled with PCI PID becoming 0xffff, observed via the attached patch.
Updated by Bill XIE 18 days ago
- File p8z77v-goodme-2to4.log p8z77v-goodme-2to4.log added
With the other ME image obtained directly from the board, IGD is not disabled, and everything seems to work fine.