3 This page describes how to run coreboot on the ASUS P3B-F mainboard.
8 +---------------------+---------------------------+
10 +=====================+===========================+
11 | Model | SST 39SF020A (or similar) |
12 +---------------------+---------------------------+
13 | Protocol | Parallel |
14 +---------------------+---------------------------+
16 +---------------------+---------------------------+
18 +---------------------+---------------------------+
20 +---------------------+---------------------------+
21 | Write protection | See below |
22 +---------------------+---------------------------+
23 | Internal flashing | yes |
24 +---------------------+---------------------------+
27 flashrom supports this mainboard since commit c7e9a6e15153684672bbadd1fc6baed8247ba0f6.
28 If you are using older versions of flashrom, below has to be done (with ACPI disabled!)
29 before flashrom can detect the flash chip:
34 # i2cset 0 0x48 0x80 0x80
37 Upon power up, flash chip is inaccessible until flashrom has been run once.
38 Since flashrom does not support reversing board enabling steps,
39 once it detects the flash chip, there will be no write protection until
42 ### CPU microcode considerations
44 By default, this board includes microcode updates for 5 families of Intel CPUs
45 because of the wide variety of CPUs the board supports, directly or with an
46 adapter. These take up a third of the total flash space leaving only 20kB free
47 in the final cbfs image. It may be necessary to build a custom microcode update
48 file by manually concatenating files in 3rdparty/intel-microcode/intel-ucode
49 for only CPU models that the board will actually be run with.
53 - Slot 1 and Socket 370 CPUs and their L1/L2 caches
54 - PS/2 keyboard with SeaBIOS (See [Known issues])
59 - Serial ports 1 and 2
64 - PS/2 keyboard may not be usable until Linux has completely booted. With SeaBIOS
65 as payload, setting keyboard initialization timeout to 2500ms may help.
67 - The coreboot+SeaBIOS combination boots so quickly some IDE hard drives are not
68 yet ready by the time SeaBIOS attempts to boot from them.
70 - i440BX does not support 256Mbit RAM modules. If installed, coreboot
71 will attempt to initialize them at half their capacity anyway
72 whereas vendor firmware will not boot at all.
74 - ECC memory can be used, but ECC support is still pending.
87 - ACPI (Support is currently [under gerrit review](https://review.coreboot.org/c/coreboot/+/41098))
92 +------------------+--------------------------------------------------+
93 | Northbridge | Intel I440BX |
94 +------------------+--------------------------------------------------+
95 | Southbridge | i82371eb |
96 +------------------+--------------------------------------------------+
97 | CPU | P6 family for Slot 1 and Socket 370 |
98 | | (all models from model_63x to model_6bx) |
99 +------------------+--------------------------------------------------+
100 | Super I/O | winbond/w83977tf |
101 +------------------+--------------------------------------------------+
106 [flashrom]: https://flashrom.org/Flashrom