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# ASUS P8Z77-V
This page describes how to run coreboot on the [ASUS P8Z77-V].
## Flashing coreboot
```{eval-rst}
+---------------------+----------------+
| Type | Value |
+=====================+================+
| Socketed flash | yes |
+---------------------+----------------+
| Model | W25Q64FVA1Q |
+---------------------+----------------+
| Size | 8 MiB |
+---------------------+----------------+
| Package | DIP-8 |
+---------------------+----------------+
| Write protection | yes |
+---------------------+----------------+
| Dual BIOS feature | no |
+---------------------+----------------+
| Internal flashing | no |
+---------------------+----------------+
```
The flash IC is located between the black and white PCI Express x16 slots (circled):
### How to flash
The main SPI flash cannot be written because the vendor firmware disables BIOSWE
and enables BLE/SMM_BWP flags in BIOS_CNTL for their latest BIOSes. An external
programmer is required. You must flash standalone, flashing in-circuit doesn't
work. The flash chip is socketed, so it's easy to remove and reflash.
## Working
- PS/2 keyboard with SeaBIOS 1.14.0 and Debian GNU/Linux with kernel 5.10.28
- Integrated Ethernet NIC
- S3 Suspend to RAM
- USB2 on rear and front panel connectors
- USB3 (Z77's and ASMedia's works)
- Integrated SATA of Z77
- Integrated SATA of ASM1061 (works under GNU/Linux but not under SeaBIOS)
- CPU Temp sensors (tested PSensor on GNU/Linux)
- TPM on TPM-header (tested tpm-tools with TPM 1.2 Infineon SLB9635TT12)
- Native raminit
- Integrated graphics with libgfxinit (VGA/DVI-D/HDMI tested and working)
- PCIe in PCIe-16x/8x slots (tested using an S3 Matrix GPU)
- Debug output from serial port
- Atheros AR9485 half-height mini PCIe WNIC adapted with Wi-Fi Go! Adapter
- Default PCIe config (PCIEX_16_3 as 1x, PCIe Port 4 to ASM1061 SATA, see below
for other potential options)
## Untested
- EHCI debugging
- S/PDIF audio
- PS/2 mouse
## Not working
- PCIEX_1_2 (expected under default PCIe config)
- Other PCIe configs (see below)
## PCIe config
On Asus vendor firmware, other than the default config already supported here,
there remain another two configs: "PCIEX_16_3 as x4, with PCIEX_1_1, PCIEX_1_2
and onboard ASM1061 disabled" and "PCIEX_16_3 as x1, but PCIe Port 4 to PCIEX_1_2,
with onboard ASM1061 disabled".
Configuring PCIEX_16_3 as x4 needs to program 0x3 to the LSB of PCHSTRP9, but
also needs to configure GPIOs in the Super I/O chip different than the default
config in this board's override tree.
Configuring PCIe Port 4 to PCIEX_1_2 needs to configure GPIOs in the Super I/O
chip differently than the default config.
I have tried a lot, but sadly I am unable to produce the same result as the vendor
firmware.
## Asus Wi-Fi Go!
Asus Wi-Fi Go! has several versions. P8Z77-V has the earliest version.
See [Asus Wi-Fi Go! v1].
## Technology
```{eval-rst}
+------------------+--------------------------------------------------+
| Northbridge | :doc:`../../northbridge/intel/sandybridge/index` |
+------------------+--------------------------------------------------+
| Southbridge | bd82x6x |
+------------------+--------------------------------------------------+
| CPU | model_206ax |
+------------------+--------------------------------------------------+
| Super I/O | Nuvoton NCT6779D |
+------------------+--------------------------------------------------+
| EC | None |
+------------------+--------------------------------------------------+
| Coprocessor | Intel Management Engine |
+------------------+--------------------------------------------------+
```
## Extra resources
- [Flash chip datasheet][W25Q64FVA1Q]
[ASUS P8Z77-V]: https://www.asus.com/supportonly/p8z77v/helpdesk_knowledge/
[W25Q64FVA1Q]: https://www.winbond.com/resource-files/w25q64fv%20revs%2007182017.pdf
[flashrom]: https://flashrom.org/Flashrom
[Asus Wi-Fi Go! v1]: ./wifigo_v1.md
|
