User:GNUtoo

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Hardware

Device/Mainboard Serial/output flash recovery mecanism
M4A785T-M
  • Serial
External programmer
Lenovo X60
  • Serial on the dock
  • USB debug
  • spkmodem
External programmer with pomona clip
Lenovo T60
  • USB debug
  • spkmodem(untried but should work)
External programmer with pomona clip(untried but should work)
Alix 1.C
  • Serial
Hot swap with the LPC dongle

My TODO list

T60

  • Find out why it hang when the power supply is removed

scripts to help getting rid of the vbios of the x60

Script 1: generate the io access for the coreboot driver

#!/usr/local/plan9/bin/rc

by the following line:

#!/opt/plan9/bin/rc
  • create the ssamfix file with:
 ,s/\[ *[0-9]+\..[0-9]+\]//g
 ,s/^ *//g
y/^[RWU]/s/^/M /g
 ,s/\nU/ ;;;UDELAY/g
 ,|uniq -c
 ,s/^ *//g
 ,s/(^[0-9]+) ([MRW])/\2 \1/g
 ,s/"/\\"/g
 ,s/^M ([0-9]+) *(\[.*)/{M, \1, "\2"},/g
 ,s/^M ([0-9]+) *(.*)/{M, \1, "\2"},/g
 ,s/:  */:/g
 ,s/...UDELAY *([0-9]+)/\1/g
 ,s/^([RW]) ([0-9]+) (.*):0x([0-9a-f]+)(.*)/{\1, \2, "", \3, 0x\4, \5},/g
  • run the following commands:
. /etc/profile.d/plan9.sh
cat dmesg| ./ssam  -f ssamfix > foo.c

Script2: compare the io access that were too fast

  • Replace {V,0,}, with {V,7,}, in src/mainboard/vendor/device/i915io.c
  • cat /dev/ttyUSB0 > accesses.txt
  • Use that script against accesses.txt to find the guilty accesses:
#!/usr/bin/env python2
import sys,re
 
def main(args):
	try:
		f = open(args[1],'ro')
	except:
		print args[0], " <file>"

	for line in f:
		if re.match("0x[0-9]*: Got .*, expect .*",line):
			line = line.replace('\r\n',).replace(", expect ",':').replace(": Got ",':')
			split = line.split(':')
			#print split
			if split[1] != split[2]:
				print line
if __name__ == '__main__':
	main(sys.argv)

How to get semantic IOs

In i915tool:

  • import your IOs in prettyregs.c
  • compile prettyregs.c
  • run prettyregs

How to get rid of the vbios of the x60 [New Version]

WARNING: DO NOT ATTEMPT TO DO THAT WITHOUT A FLASH RECOVERY MECANISM

Apply the coreboot patches, and adapt them for your mainboard

Then configure coreboot with:

[*] Output verbose x86emu debug messages
[ ]   Trace JMP/RETF
[ ]   Trace all opcodes
[ ]   Log Plug&Play accesses
[ ]   Log Disk I/O
[ ]   Log PMM
[ ]   Debug VESA BIOS Extensions
[ ]   Redirect INT10 output to console
[ ]   Log intXX calls
[ ]   Log special memory accesses
[ ]   Log all memory accesses
[*]   Log IO accesses

Build and flash coreboot.

git clone my fork of the i915tool until the code is merged in the official i915tool.

Get the tarball that contains the generated code, extract it.

Also get the i915_regs.h.gz file, decompress it and put it in final/

Then go into i915tool and apply some patches for the x60 or redo them for your mainboard.

Run make:

$ cd i915tool
$ make

Then go into the x60 directory(or the directory of your device):

$ cd x60

use picocom -b 115200 /dev/ttyUSB0 or stty to set the bauds of the Serial port. Then get logs:

$ cat /dev/ttyUSB0 | tee coreboot.log

Then remove the binary symbols, dos2unix will help identifying where they are:

$ dos2unix coreboot.log 
dos2unix: Binary symbol found at line 136332
dos2unix: Skipping binary file coreboot.log

Then do:

$ dos2unix coreboot.log

Then remove the lines before and after the log, the log looks like that:

[0047229e]c000:51cb outl(0x80001014, 0x0cf8)
[0047325f]c000:51d4 inw(0x0cfc) = 0x50a1

Then run make and fix the errors:

$ make

Then copy to coreboot as it says. Then if necessary try to compact the source code a bit, here for me I have a really long list of:

io_i915_write32(0xcffbe001,0x8001);
io_i915_write32(0xcffbe001,0x8005);
io_i915_write32(0xcffbe001,0x8009);
io_i915_write32(0xcffbe001,0x800d);
io_i915_write32(0xcffbe001,0x8011);

That can be replaced with:

int i = 0;
for (i=0x8001;i<0x3fffa;i+=4){
io_i915_write32(0xcffbe001,i);
}

Import the final code into the chromium fork of coreboot with my patches on top.