Hi Liu,
I could trace the illegal instruction during qemu startup down to this function in cpu-all.h cpu_get_real_ticks(void) which is using the time base registers - the crash is during vm_start - cpu_enable_ticks which calls cpu_get_real_ticks.
I believe e500 is using SPR's for this purpose and not dedicated time base registers - am I missing a patch to this file?
This is what I have in cpu_get_real_ticks - ( _ARCH_PPC is defined and not ARCH_PPC64)
__asm__ __volatile__ (
"mftbu %1\n\t"
"mftb %L0\n\t"
"mftbu %0\n\t"
"cmpw %0,%1\n\t"
"bne $-16"
: "=r" (retval), "=r" (junk));
I did try to short circuit this by borrowing this from the code below to see if I can avoid the crash which I could do so -
static int64_t ticks = 0;
return ticks++
qemu does boot up and goes to the qemu prompt when I telnet to the boardip/port but I don't seem to get any login prompt for the VM - bear with me..but I am fiddling with this - sending this out anyway for suggestions..
On my 8548 CDS board
/bin # ./qemu-system-ppcemb -enable-kvm -m 64 -nographic -M mpc8544ds -kernel /tmp/uImage.8544 -initrd /tmp/rootfs.ext2.gz.small -L /usr/local/share/qemu -append "root=/dev/ram rw console=ttyS0,115200" -serial tcp::4444,server
<< goes to qemu prompt when I telnet to board ip / port >>
(qemu)
(qemu) info version
0.9.1
(qemu) info network
VLAN 0 devices:
user.0:
virtio.0: model=virtio,macaddr=52:54:00:12:34:56
(qemu) info kvm
kvm support: enabled
(qemu) info status
VM status: running
On the telnet session:
$ telnet 10.11.224.180 4444
Trying 10.11.224.180...
Connected to 10.11.224.180 (10.11.224.180).
Escape character is '^]'.
<< nothing here >>
i'd appreciate your reply..
Thanks, Rahul
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