[syslinux] Serial console with pxelinux on Soekris net4501

[H. Peter Anvin]

Steve R. Brudenell wrote:
> Hello,
> 
> I have a Soekris net4501, which I'm PXE booting using pxelinux. Everything 
> seems to be working splendidly, except for the fact that I can't seem to make 
> pxelinux understand use the net4501's serial console port correctly.
> 
> The net4501 uses the serial console as its primary interface; I'm using a null 
> modem cable and minicom to operate with it. At boot, its startup messages go 
> out over the serial console and everything works as it should, until the 
> point where it gets to finding pxelinux.0 from my tftp server. As soon as the 
> bios finds and loads it, I get garbage over minicom that looks like this:
> 
> 3;01H3;97HP3;01HX3;01HE3;01HL3;01HI3;01HN3;01HU3;01HX3;01H 
> 3;01H23;01H.3;01H03;HM
> 

These are VT100 control codes, possibly mangled.  You have serial
forwarding set in your BIOS *and* serial port enabled in pxelinux, which
is a no-no.  You must have one or the other, not both.
	
	-hpa