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# ASUS P8Z77-M
This page describes how to run coreboot on the [ASUS P8Z77-M].
## Flashing coreboot
```eval_rst
+---------------------+----------------+
| Type | Value |
+=====================+================+
| Model | W25Q64FVA1Q |
+---------------------+----------------+
| Size | 8 MiB |
+---------------------+----------------+
| Package | DIP-8 |
+---------------------+----------------+
| Socketed | yes |
+---------------------+----------------+
| Write protection | yes |
+---------------------+----------------+
| Dual BIOS feature | no |
+---------------------+----------------+
| Internal flashing | yes |
+---------------------+----------------+
```
The flash chip is located between the blue SATA ports.
The main SPI flash cannot be written internally because Asus disables BIOSWE and
enables ``BLE/SMM_BWP`` flags in ``BIOS_CNTL`` for their latest bioses.
To install coreboot for the first time, the flash chip must be removed and
flashed with an external programmer; flashing in-circuit doesn't work.
The flash chip is socketed, so it's easy to remove and reflash.
## Working
- All USB2 ports (mouse, keyboard and thumb drive)
- USB3 ports on rear (Boots SystemRescue 6.0.3 off a Kingston DataTraveler G4 8GB)
- Gigabit Ethernet (RTL8111F)
- SATA3, SATA2 (all ports, hot-swap not tested)
(Blue SATA2) (Blue SATA2) (White SATA3)
port 5 port 3 port 1
port 6 port 4 port 2
- CPU Temp sensors and hardware monitor (some values don't make sense)
- Native and MRC memory initialization
(please see [Native raminit compatibility] and [MRC memory compatibility])
- Integrated graphics with both libgfxinit and the Intel Video BIOS OpROM
(VGA/DVI-D/HDMI tested and working)
- 16x PCIe GPU in PCIe-16x/4x slots (tested using nVidia Quadro 600 under SystemRescue 6.0.3
(Arch based))
- Serial port
- PCI slot
Rockwell HSF 56k PCI modem, Sound Blaster Live! CT4780 (cards detected, not function tested)
Promise SATA150 TX2plus (R/W OK to connected IDE hard drive, OpRom loaded, cannot boot from
SeaBIOS)
- S3 suspend from Linux
- 2-channel analog audio (WAV playback by mplayer via back panel line out port)
- Windows 10 with libgfxinit high resolution framebuffer and VBT
## Known issues
- If you use MRC raminit, the NVRAM variable gfx_uma_size may be ignored as IGP's UMA could
be reconfigured by the blob.
- If SeaBIOS is used for payload with libgfxinit, it must be brought in via coreboot's config.
Otherwise integrated graphics would fail with a black screen.
- PCI POST card is not functional because the PCI bridge early init is not yet done.
- The black PCIEX16_2 slot, although can physically fit an x16, only has physical contacts for
an x8, and is electrically an x4 only.
## Untested
- Wake-on-LAN
- USB3 on header
- TPM header
- EHCI debugging (Debug port is on the 5-pin side of USB2_910 header)
- HDMI and S/PDIF audio out
## Not working
- PS/2 keyboard or mouse
- 4 and 6 channel analog audio out: Rear left and right audio is a muted
copy of front left and right audio, and the other two channels are silent.
## Native (and MRC) raminit compatibility
- OCZ OCZ3G1600LVAM 2x2GB kit works at DDR3-1066 instead of DDR3-1600.
- GSkill F3-1600C9D-16GRSL 2x8GB SODIMM kit on adapter boots, but is highly unstable
with obvious pattern of bit errors during memtest86+ runs.
- Samsung PC3-10600U 2x2GB kit works at full rated speed.
- Kingston KTH9600B-4G 2x4GB kit works at full rated speed.
## Extra onboard buttons
The board has two onboard buttons, and each has a related LED nearby.
What controls the LEDs and what the buttons control are unknown,
therefore they currently do nothing under coreboot.
- BIOS_FLBK
OEM firmware uses this button to facilitate a simple update mechanism
via a USB drive plugged into the bottom USB port of the USB/LAN stack.
- MemOK!
OEM firmware uses this button for memory tuning related to overclocking.
## 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-M]: https://www.asus.com/Motherboards/P8Z77M/
[W25Q64FVA1Q]: https://www.winbond.com/resource-files/w25q64fv%20revs%2007182017.pdf
[flashrom]: https://flashrom.org/Flashrom
|
