3 This page describes how to run coreboot on the ASUS P2B-LS mainboard.
8 - P2B-L (Same circuit board with SCSI components omitted)
9 - P2B-S (Same circuit board with ethernet components omitted)
14 +---------------------+---------------------------+
16 +=====================+===========================+
17 | Model | SST 39SF020A (or similar) |
18 +---------------------+---------------------------+
19 | Protocol | Parallel |
20 +---------------------+---------------------------+
22 +---------------------+---------------------------+
24 +---------------------+---------------------------+
26 +---------------------+---------------------------+
27 | Write protection | no |
28 +---------------------+---------------------------+
29 | Dual BIOS feature | no |
30 +---------------------+---------------------------+
31 | Internal flashing | yes |
32 +---------------------+---------------------------+
35 [flashrom] works out of the box since 0.9.2.
36 Because of deficiency in vendor firmware, user needs to override the laptop
37 warning as prompted. Once coreboot is in place there will be no further issue.
39 ### CPU microcode considerations
41 By default, this board includes microcode updates for 5 families of Intel CPUs
42 because of the wide variety of CPUs the board supports, directly or with an
43 adapter. These take up a third of the total flash space leaving only 20kB free
44 in the final cbfs image. It may be necessary to build a custom microcode update
45 file by manually concatenating files in 3rdparty/intel-microcode/intel-ucode
46 for only CPU models that the board will actually be run with.
50 - Slot 1 and Socket 370 CPUs and their L1/L2 caches
51 - PS/2 keyboard with SeaBIOS (See [Known issues])
53 - Ethernet (-LS, -L; Intel 82558)
54 - SCSI (-LS, -S; Adaptec AIC7890)
60 - Serial ports 1 and 2
66 - PS/2 keyboard may not be usable until Linux has completely booted.
67 With SeaBIOS as payload, setting keyboard initialization timeout to
68 500ms may fix the issue.
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.
76 - Termination is enabled for all SCSI ports (if equipped). Support to
77 disable termination is pending. Note that the SCSI-68 port is
78 always terminated, even with vendor firmware.
94 +------------------+--------------------------------------------------+
95 | Northbridge | Intel I440BX |
96 +------------------+--------------------------------------------------+
97 | Southbridge | i82371eb |
98 +------------------+--------------------------------------------------+
99 | CPU | P6 family for Slot 1 and Socket 370 |
100 | | (all models from model_63x to model_6bx) |
101 +------------------+--------------------------------------------------+
102 | Super I/O | winbond/w83977tf |
103 +------------------+--------------------------------------------------+
108 [flashrom]: https://flashrom.org/Flashrom