Hello again,
I'm still trying to debootstrap my NanoNote. I have the feeling that
there is something fairly fundamental that is preventing this from
working. Maybe there is a MIPS expert out there who understands this properly?
The NanoNote ships with OpenWRT. I have a debootstrapped tree on a
microSD card.
The symptom I have is that executables from my Debian chroot just hang
using 100% CPU when run. When I run them under gdb I see something
like this:
# gdb /usr/sbin/chroot
(gdb) run /card /bin/ls
{100% CPU observed in top in another terminal}
^C
Program received signal SIGINT, Interrupt.
0x2aac2d00 in ?? ()
(gdb) disas 0x2aac2cf0 0x2aac2d10
Dump of assembler code from 0x2aac2cf0 to 0x2aac2d10:
0x2aac2cf0: lui gp,0x2
0x2aac2cf4: addiu gp,gp,-7392
0x2aac2cf8: addu gp,gp,t9
0x2aac2cfc: move v0,a0
0x2aac2d00: swc1 $f20,56(a0)
0x2aac2d04: swc1 $f21,60(a0)
0x2aac2d08: swc1 $f22,64(a0)
0x2aac2d0c: swc1 $f23,68(a0)
It always hangs at the same address in all the programs I've tried (ls,
bash, echo, ...), except for ldconfig, which I believe is the only
statically-linked program; that stops at a different address which
disassembles to:
0x00441530 in ?? ()
(gdb) disas 0x00441520 0x00441540
Dump of assembler code from 0x441520 to 0x441540:
0x00441520: lui v0,0x1c3
0x00441524: ori v0,v0,0xffff
0x00441528: and a0,a0,v0
0x0044152c: lui v0,0xfe3c
0x00441530: cfc1 v1,$31
0x00441534: nop
0x00441538: and v1,v1,v0
0x0044153c: or v1,v1,a0
That "swc1 $f20" looks like a floating-point instruction. Similarly
"cfc1 v1,$31".
My guess is that this is the first FP instruction that it finds, and
that there is either a kernel or hardware incompatibility issue. Does
the CPU in my NanoNote have FP? Is there some sort of kernel emulation
or other support requirement?
Thanks for any suggestions.
Phil.
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