Hello,

I have a RiscPC with a rev 2 sa110. To avoid the istream abort bug I used
the option "!sa110.dcache" with the bootloader. This slowed things down but 
seemed to work. Since this isn't a nice solution I tried some kernel hacking 
to mitigate the bug.
  So far I changed .../sys/arch/arm32/arm32/fault.c and replaced the lines

		if (rv == KERN_SUCCESS)
			goto out;

(That's near line 420) with the following:

		if (rv == KERN_SUCCESS) {
#ifdef SA110_ISTREAM_ABORT_BUG
			/* try to avoid sa110 < rev 3 istream abort bug */
			vm_offset_t last_word_addr;
			u_int instruction;
			int status;

			/* if the last instruction of the page is a */
			/* ld or ldm to pc, fault in the next page */
			last_word_addr = va + PAGE_SIZE - 4;
			status = fetchuserword(last_word_addr, &instruction);
			if (status == 0 && 
			    (((instruction & 0x0c10f000) == 0x0410f00) ||
			    ((instruction & 0x0e108000) == 0x0810800)))
				fetchuserword(last_word_addr + 4, &instruction);
#endif /* SA110_ISTREAM_ABORT_BUG */
			goto out;
		}

Can anyone comment on this? Is this the right place and the right way to do 
such a thing?
  I'm aware that the page after the ld/ldm to pc might get paged out later on. 
But I haven't got an idea where I could catch this.

Greetings,
Ralf Menzel