>Number:         1487
>Category:       port-amiga
>Synopsis:       Kernel panics from uninitialized data
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    gnats-admin (GNATS administrator)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 20 19:50:01 1995
>Last-Modified:
>Originator:     Eduardo Horvath
>Organization:
	Mud
>Release:        Sept 16 1995
>Environment:
System: NetBSD home 1.0A NetBSD 1.0A (DEBUG) #398: Sat Sep 16 06:23:58 PDT 1995 toor@home:/home2/src/sys/arch/amiga/compile/DEBUG amiga


>Description:
	The kernel panics on 4MB machines if fast RAM is not initialized to zero
	before the kernel is copied out of chip RAM.
>How-To-Repeat:
	Run the kernel on a 4MB machine for a while and watch it crash randomly.
>Fix:
	Clear out all of fast RAM before copying the kernel:

*** src/sys/arch/amiga/amiga/amiga_init.c.orig	Sat Aug 19 00:11:39 1995
--- src/sys/arch/amiga/amiga/amiga_init.c	Sat Sep 16 06:11:21 1995
***************
*** 216,221 ****
--- 216,229 ----
  		sp = memlist->m_seg;
  		esp = sp + memlist->m_nseg;
  		for (; sp < esp; i++, sp++) {
+ 			register long* bp;
+ 			register long* ep;
+ 			
+ 			if (sp->ms_attrib & MEMF_FAST) {
+ 				bp = (long*)sp->ms_start;
+ 				ep = (long*)(sp->ms_start + sp->ms_size);
+ 				while( bp < ep ) *bp++ = 0x0;
+ 			}
  			if ((sp->ms_attrib & (MEMF_FAST | MEMF_24BITDMA)) 
  			    != (MEMF_FAST|MEMF_24BITDMA))
  				continue;
>Audit-Trail:
>Unformatted: