Hi, On Tuesday 17 November 2009 18:39:40 myuboot@xxxxxxxxxxx wrote: > On Tue, 17 Nov 2009 10:33 +0100, "Ralf Baechle" <ralf@xxxxxxxxxxxxxx> > > wrote: > > On Mon, Nov 16, 2009 at 06:21:21PM -0600, myuboot@xxxxxxxxxxx wrote: > > > I have been struggling to bring up a MIPS 32 board with busybox with or > > > without initramfs. > > > The kernel stucks there without the shell coming up. > > > > > > [ 1.153000] nf_conntrack version 0.5.0 (1024 buckets, 4096 max) > > > [ 1.161000] ip_tables: (C) 2000-2006 Netfilter Core Team > > > [ 1.167000] TCP cubic registered > > > [ 1.170000] NET: Registered protocol family 17 > > > [ 25.971000] Freeing unused kernel memory: 1032k freed > > > [ 39.969000] Algorithmics/MIPS FPU Emulator v1.5 > > > > > > > > > What I tried here is to use initramfs with statically linked busybox. > > > The initramfs seems to be up, and runs the commands in the /init one by > > > one, and then it goes to a inifite loop in r4k_wait at > > > arch/mips/kernel/genex.S. > > > > r4k_wait is called by the idle loop. Which means the kernel has no > > process > > to run so runs the idle loop. This might be because there is no other > > process left running or because all processes are waiting for I/O for > > example. So it's not uncommon that even busy systems ocasionally briefly > > run the idle loop. In other words, seeing the processor executing > > r4k_wait does not necessarily mean something went wrong. In this case - > > also along with the other information you've provieded it's not obvious > > what has gone wrong. > > > > Ralf > > According to an email from Kevin, I added a symbolic link from > switch_root to busybox. The switch_root seems to be found now based on > the execution sequence, but I got the following error - "Kernel panic - > not syncing: Attempted to kill init!". This is the same error when I > tried to start the shell without initramfs. Something must be wrong, but > I can't quite figure out. > > [ 9.250000] Freeing unused kernel memory: 1032k freed > [ 10.463000] Algorithmics/MIPS FPU Emulator v1.5 > [ 41.695000] Kernel panic - not syncing: Attempted to kill init! > [ 41.701000] Rebooting in 3 seconds. > > Thanks for your help. Andrew > > (gdb) c > Continuing. > > Breakpoint 2, do_execve (filename=0x9780a000 "/init", argv=0x943dd2bc, > envp=0x943dd230, regs=0x97819e30) > at fs/exec.c:1293 > 1293 retval = unshare_files(&displaced); > (gdb) c > Continuing. > > Breakpoint 2, do_execve (filename=0x9780a000 "/sbin/switch_root", > argv=0x4f7450, envp=0x4f7464, regs=0x97819f30) > at fs/exec.c:1293 > 1293 retval = unshare_files(&displaced); > (gdb) c > Continuing. If you happen to use uClibc and gcc-4.4.0 or superior, make sure that you have that patch applied to uClibc: http://www.mail- archive.com/uclibc@xxxxxxxxxx/msg04483.html -- WBR, Florian
