questions

[Sanjay lal]

hello,

I had a few questions regarding linuxbios:
1) Does it support tftpboot,bootp etc?
2) Does it support GDB stubs for debugging?
3) Are there any licensing issues involved if used?

Any information is of great help.
thanks in advance
Sanju

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[Christopher Stutts]

On Wed, 2003-02-12 at 12:13, Sanjay lal wrote:
>
> Does it support GDB stubs for debugging?

If you shell out the bucks for an x86 JTAG ICE from American Arium and
compile with -gdwarf-2, you can do source level debug.

[Ronald G. Minnich]

On Wed, 12 Feb 2003, Sanjay lal wrote:
> Are there any licensing issues involved if used?

GPL. If you use it you have to release any mainboard support you write 
back to the source tree.

ron

SPD issues

[Richard Smith]

Ok.  Under the excellent guidance of Ron I finally got LinuxBIOS to boot 
  on our custom 440bx board by hardcoding the right values into the DRB 
and page size registers.

The problem seems to be that linuxBIOS dosen't detect the RAM properly 
in row 0.  Its seems to be setting it up at row 1.

I've been trying to use dump_spd_registers to see if I can figure out 
whats going on but all I seem to get is something more or less like the 
following:

dimm 50

dimm 51
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04
04 04 04 04 04 04 04 04 04 04 04 04 04 04 04 04

I've played with SMBUS_MEM_DEVICE_START but I still just get 04's. 
What's the standard adress for the spd info?

If this is truly what linuxbios is getting back from the spd then I can 
see why its confused.

dump_spd_registers bug

[Richard Smith]

dump_spd_registers seems to have a bug.

After it calls smbus_read_byte it does a 'jz dump_spd_reg_next_dimm'

Why?

Is it looking to see if the loaded data byte is zero?  if so then this 
dosen't work because the 'in' instruction from the read dosen't set the 
flags.

And even if this did work zeros occur naturally in the spd datastream so 
skipping the dimm if you get a zero is bad.

I've modified smbus_read_byte to set/clear the carry bit on 
failure/success and now dump_spd_registers checks that and that seems to 
work fine.

Is this the right solution or am I still missing something?

[Adam Sulmicki]

> I had a few questions regarding linuxbios:
> Does it support tftpboot,bootp etc?

yes, but not directly. you will have to place 'etherboot' on top of
LinuxBIOS. But then that's the idea. That is : having an modular bios.