The nano note's CPU does NOT have a fp. So it needs the kernel to emulate the fp instruction.
yajin http://vm-kernel.org 2010/3/26 Phil Endecott <[email protected]>: > 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. > > > > > > -- > To UNSUBSCRIBE, email to [email protected] > with a subject of "unsubscribe". Trouble? Contact > [email protected] > Archive: > http://lists.debian.org/[email protected] > > -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
