2009/1/27 Jamie Lokier <jamie@xxxxxxxxxxxxx>: > loody wrote: >> BTW, I also find that if I want uclinux kernel to support ELF binary >> file, I also have to enable the mmu option. >> But the format of cross-compiled binary file like busybox is only ELF, >> if there is option I can add to let busybox and other binary files >> compiled in different format. > > On uClinux with no MMU, you have to use FLT format (all architectures > support this I think) or FDPIC-ELF (just a few architectures support > this, the advantage is proper shared libraries and loadable modules). > > To make FLT files, usually you add "-Wl,-elf2flt=-s32768" or something > like that to the GCC command line. That option sets the stack size; > the size needed is different for each application. Too small and the > app will crash or worse, corrupt memory. Too large and it'll use a > lot of memory, and won't start at all after the system has developed > memory fragmentation. Enjoy :-) > > -- Jamie Hi: thanks for your kind help. After reading your replies, I googled the elf2flt and also try the options you suggest to me. But I find some problem while transferring the ELF to FLT. 1. I see there is a tool called, arm-linux-elf2flt. I try to use it to transfer my busybux as FLT format, but it complains "busybox: Input file contains no relocation info" so I googled the net,http://arc-linux.org/pipermail/arc-linux-dev/2006-December/000250.html, and guess maybe the elf2flt.ld is the relocation it needed. but it still complain: "File is not an object file" so, it seems I have to make a object relocation file to let this tool, arm-linux-elf2flt, work. but how? 2. I use "-Wl,-elf2flt=-s1024" with arm-linux-gcc and it says: /media/sda6/uclinux/usr/local/bin/../lib/gcc/arm-linux/3.4.4/../../../../arm-linux/bin/ld.real: address 0x53880 of a.out.gdb section .text is not within region flatmem /media/sda6/uclinux/usr/local/bin/../lib/gcc/arm-linux/3.4.4/../../../../arm-linux/bin/ld.real: error: no memory region specified for loadable section `__libc_freeres_fn' collect2: ld returned 1 exit status it seems the elf2flt.ld need some modification, if I guess correctly. 3. Do i use the wrong toolchain, since I use arm-linux instead of arm-elf. If so, where I can download arm-elf toolchain as arm-linux did on uclinux.org, except those obselete. BTW, I have use build root to re-get the toolchain. But when I enable elf2flt config. the compile will show the error message below: /media/sda6/uclinux/buildroot-2009.02-rc2/toolchain_build_arm/binutils-2.19-build/bfd/libbfd.a(compress.o): In function `bfd_uncompress_section_contents': /media/sda6/uclinux/buildroot-2009.02-rc2/toolchain_build_arm/binutils-2.19/bfd/compress.c:96: undefined reference to `inflateInit_' /media/sda6/uclinux/buildroot-2009.02-rc2/toolchain_build_arm/binutils-2.19/bfd/compress.c:103: undefined reference to `inflate' make: *** [elf2flt] Error 1 Have anyone pump to this problem before? appreciate your help, miloody -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
