RE: [Etherboot-developers] 5.1 will not boot on 486 was Serial Port Debugging

[Timothy L. <tim...@us...>]

OK, more information.  There does seem to be an issue with currticks.
In main (main.c) I placed:

unsigned long x = currticks(); 

as in: 
int main(struct Elf_Bhdr *ptr)
{
	char *p;
	int state;
++ 	unsigned long x = currticks();
	for (p = _bss; p < _ebss; p++)
		*p = 0;	/* Zero BSS */

	console_init(); 
	arch_main(ptr); 
#ifdef	DELIMITERLINES
	for (i=0; i<80; i++) putchar('=');
#endif
	rom = *(struct rom_info *)phys_to_virt(ROM_INFO_LOCATION);
	
	printf("ROM segment %#hx length %#hx reloc %#x\n",
rom.rom_segment,
		rom.rom_length << 1, (unsigned long)_text);
	printf("Got Here 0\n");
	gateA20_set(); 
	printf("Got Here 1\n");
	print_config();
	printf("Got Here 2\n");
	get_memsizes();
	printf("Got Here 3\n");

before any of my debugging printfs.  The execution did not get past that
line. (None of the other prints occurred.)

So, I modified empty_8042 in misc.c to remove the call to currticks
(repaced with a simple counting loop) as follows:

static void empty_8042(void)
{
	unsigned long time;
	char st;
	int x;

--	time = currticks() + TICKS_PER_SEC;	/* max wait of 1 second
*/ 
++	time = 1000;
++	x = 0;
	printf("empty_8042 1\n");
--	while ((((st = inb(K_CMD)) & K_OBUF_FUL) ||
	       (st & K_IBUF_FUL)) &&
	       curticks() < time)
++	while ((((st = inb(K_CMD)) & K_OBUF_FUL) ||
	       (st & K_IBUF_FUL)) &&
	       x++ < time)
			inb(K_RDWR);
}

This allowed me to return from gateA20_set() and the code executed as
far as the call to get_memsizes();

I will review get_memsizes (when I find it).

Tim
> -----Original Message-----
> From: eth...@li...
[mailto:etherboot-
> dev...@li...] On Behalf Of Timothy Legge
> Sent: Sunday, January 26, 2003 10:01 AM
> To: eth...@li...
> Cc: 'Eric W. Biederman'; 'Tom Trebisky'
> Subject: RE: [Etherboot-developers] 5.1 will not boot on 486 was
Serial
> Port Debugging
> 
> A little more information:
> 
> I tracked through misc.c and placed printfs:
> 
> #if defined(PCBIOS) && !defined(IBM_L40)
> static void empty_8042(void)
> {
> 	unsigned long time;
> 	char st;
> 	printf("empty_8042 0\n");
> 	time = currticks() + TICKS_PER_SEC;	/* max wait of 1 second
> */
> 	printf("empty_8042 1\n");
> 	while ((((st = inb(K_CMD)) & K_OBUF_FUL) ||
> 	       (st & K_IBUF_FUL)) &&
> 	       currticks() < time)
> 		inb(K_RDWR);
> 	printf("empty_8042 2\n");
> }
> #endif	/* IBM_L40 */
> 
> I only received the first printf: empty_8042 0.  I then moved into
> arch/i386/core/i386_timer.c but non of the printfs I placed in
currticks
> displayed anything.
> 
> Thinking it might be dieing as a result of a previous operation, I
> changed the first printf("empty_8042 0\n"); to:
> 
> int x;
> for(x=0;x<1000;x++)
> 	printf("empty_8042 %d\n", x);
> 
> This properly displayed the correct number of llines, but again
failed.
> Is it possible that it cannot find currticks?
> 
> Tim
> 
> 
> 
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