Hi,
I have solved the "reloc type R_ARM_PC24 unsupported in this context"
error by modifying elf2flt.c:
-Erwin
...
#elif defined(TARGET_arm)
case R_ARM_ABS32:
relocation_needed = 1;
break;
case R_ARM_REL32:
case R_ARM_THM_PC11:
case R_ARM_THM_PC22:
// ==> add the following 4 lines:
case R_ARM_PC24:
case R_ARM_PLT32:
case R_ARM_GOTPC:
case R_ARM_GOT32:
relocation_needed = 0;
break;
default:
goto bad_resolved_reloc;
Am Mittwoch, den 20.05.2009, 12:29 -0400 schrieb Jeff Bacon:
> Hi, I've just started on a uClinux 2.6 port to a custom ARM7TDMI board
> (we've had a uClinux 2.4 kernel running with no problems for a couple
> of years now, but decided to take the plunge and upgrade). I just
> joined the mailing list and am trying to resurrect the thread below
> from Erwin...
>
>
> First. here is some background on where we are right now
>
> We are currently using the same base kernel and toolchain mentioned
> below(uClinux-dist-20080808, snapgear toolchain
> arm-linux-tools-20070808.tar.gz) and we're having a ton of issues with
> getting our XIP ROMFS root filesystem working out of flash (the kernel
> boots, the filesystem mounts and I get a SASH prompt, but the system
> is HIGHLY unstable and usually crashes after a couple of commands). In
> fact, basic things are broken such as "cat". I've set the init=/bin/sh
> kernel parameter to boot immediately into the shell, but if I try
>
> "cat /etc/motd", I get a ton of output like this(note, ROMFS debugging
> is turned ON):
>
> ****************************************************************************************
> <snip>
> VFS: Mounted root (romfs filesystem) readonly.
> Freeing init memory: 76K
> BINFMT_FLAT: ROM mapping of file (we hope)
> BINFMT_FLAT: Allocated data+bss+stack (21094 bytes): 2b8004
> p=2bfffc
> start_thread(regs=0x1eff08, entry=0x280044, start_stack=0x2bffb8)
>
> Sash command shell (version 1.1.1)
> /> ls /etc
> BINFMT_FLAT: ROM mapping of file (we hope)
> BINFMT_FLAT: Allocated data+bss+stack (10894 bytes): 2f0004
> p=2f3ffc
> start_thread(regs=0x2c7fb0, entry=0x2e0044, start_stack=0x2f3f80)
> inittab modprobe.conf motd passwd ramfs.img
> rc services version
> /> cat /etc/motd
> BINFMT_FLAT: ROM mapping of file (we hope)
> BINFMT_FLAT: Allocated data+bss+stack (11541 bytes): 2cc004
> p=2cfffc
> start_thread(regs=0x2b7fb0, entry=0x2c8044, start_stack=0x2cff78)
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> : : No such file or directory
> />
> ****************************************************************************************
> Mounting /proc works, but I can't cat any of those files as well, but
> either way, the system only SOMETIMES makes it this far before dying
> completely (just stalls, no kernel panics or oops or anything).
>
> Anyway, while trying to debug this, the first thing I tried was taking
> Flash out of the equation. So in my bootloader I restrict system RAM
> to 4MB (we have an 8MB part) and copy the ROMFS image from flash into
> the 2nd 4MB of RAM. I add the mem=4MB kernel parameter to restrict
> uClinux to the 1st 4MB of RAM, then compiled the uclinux MTD driver
> and gave it the location of the ROMFS in the 2nd half of RAM. The
> kernel boots and the uclinux mtd driver finds and mounts it and I get
> the prompt again, but the behavior is exactly the same, highly
> unstable, things like "cat" don't work.
>
> So next I tried to compile userland WITHOUT XIP to see if that was the
> problem and this is when I found the exact same issue as Erwin
> described below. I've set the same options as you have in my
> congif.arch file and I get the same "ERROR: reloc type R_ARM_PC24
> unsupported in this context" all over the place as you did.
>
> So, any idea what the issue is? Is it a toolchain problem? Is it a
> kernel source problem? Again, I'm using the BASE
> uClinux-dist-20080808, I haven't applied any of the patches as I
> wanted to work from the known stable base tree.
>
> If anyone else has ever encountered the issues I'm describing and you
> figured out that it's not XIP issues, can anyone let me in on the
> secret?
>
> Finally, if I just want to separate kernel code issues from root
> filesystem issues, what's the easiest, most stable method for creating
> and mounting a root filesystem image (System RAM = 8MB, System Flash =
> 8MB). Thanks for any and all help.
>
> Cheers,
>
> JB
>
> *************************************************************************************************
>
> List: uclinux-dev
> Subject: [uClinux-dev] errors when linking without XIP
> From: Erwin Authried <eauth () softsys ! co ! at>
> Date: 2009-03-23 11:26:51
> Message-ID: 1237807611.711.254.camel () justakiss ! home ! at
>
> Hi,
>
> I have always compiled applications for ARM7TDMI with pic (-fpic
> -msingle-pic-base) without problems. Now I tried to build without pic,
> and got lots of
>
> ERROR: reloc type R_ARM_PC24 unsupported in this context
>
> during linking. After searching the archives, I tried to run elf2flt
> without the "-a" option. This time, the link succeeds, but I get a
>
> BINFMT_FLAT: reloc outside program ...
>
> when I try to run the application on the target (I tried several
> applicatons, all had the same problem). I have used
> uClinux-dist-20080808 and the snapgear toolchain
> arm-linux-tools-20070808.tar.gz.
> I modified vendors/Atmel/AT91/config.arch to disable XIP, and built from
> scratch:
>
> ############################################################################
>
> CPUFLAGS :=
> # VENDOR_CFLAGS # not required here
> DISABLE_XIP := 1 # XIP works fine
> DISABLE_MOVE_RODATA := 1 # until we get a toolchain release
> DISABLE_SHARED_LIBS := 1
> # LOPT := -O2 # library is alway 02
> # UOPT := -Os # user apps are always Os
>
> ############################################################################
>
> Any ideas what's wrong?
>
> -Erwin
>
--
Dipl.-Ing. Erwin Authried
Softwareentwicklung und Systemdesign
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