Re: [9fans] Alpha bootloader "kernel stack not valid"

[cblack1@uiuc.edu]

On Wed, Feb 22, 2006 at 10:57:10PM -0800, geoff@collyer.net wrote:
> There are several memmoves in that vicinity; could you show us the
> line and some surrounding context?

Sure. From /sys/src/boot/alphapc/bootp.c, in bootp(), near the bottom:

	addr = (uchar*)entry;
	p = tftpb.data+sizeof(Exec);
	dlen -= sizeof(Exec);
	segsize = text;
	for(;;){
		if(dlen == 0){
			if((dlen = tftpread(fd, &server, &tftpb, sizeof(tftpb.data))) < 0)
				return -1;
			p = tftpb.data;
		}
		if(segsize <= dlen)
			i = segsize;
		else
			i = dlen;
		//print("addr: %lux p: %lux i: %d\n", addr, p, i);
		//print("addr[0]: ");
		//print("%x\n",addr[0]);
		memmove(addr, p, i);

That last one is the offending memmove. With those print()'s
uncommented, the first two show up, but the third doesn't.

> "kernel stack not valid halt" is coming from SRM, right?

Yep. Looks like this:

yomiko (10.0.0.12!67): /alpha/conf/10.0.0.14.../alpha/9apc
659416
halted CPU 0

halt code = 2
kernel stack not valid halt
PC = 283bebeb8dfb08cc
>>>

Yomiko is running the tftp server, and I've successfully used tftp to
start up the netbsd net loader and the debian install image.

> I'm surprised that your alpha didn't come with a 2114x, and that SRM's
> bootp/tftp loader can drive any other kind of ethernet card.  Does
> your 82559 have PXE enabled or have the additional chip added with
> bootp and tftp boot burned into it (there's a socket for it on most
> ethernet cards)?

Well, it wasn't actually an alpha *machine*. I found the mobo/CPU in a
box of other dilapidated hardware a few years ago, and recently came
upon some RAM that works with it. Much to my surprise, it booted. I was
completely surprised that the Intel card worked with it, too. I'm not
sure about the PXE or netboot rom; I'm not sure I've ever tried this
card elsewhere. It has no socket, but does have an Atmel chip soldered
to it. (None of that would work with SRM, anyway, would it?) It shows up
as eia0 instead of ewa0, but works the same. It looks like this:

http://www.pluto.ai.kyutech.ac.jp/plt/matumoto/bench/oldpc/fxp.jpg

~chip