Hi Greg, Greg Ungerer wrote, > Hi Waldemar, > > Waldemar Brodkorb wbx at openadk.org wrote: > > Greg Ungerer wrote, > >> Hi Waldemar, > >> On 23/04/16 08:50, Waldemar Brodkorb wrote: > >> >Hi Greg, > >> >Greg Ungerer wrote, > >> > > >> >>>How could I generate the information for you? Do you have > >> >>>a kernel patch I would need to apply? I can bootup a kernel > >> >>>and execute code, I just can't type anything into the serial > >> >> > >> >>Attached is a kernel patch that modifies binfmt_flat to print > >> >>out the reloc number along with the reloc error. That way we can > >> >>map that back to the reloc entry number printed out in the verbose > >> >>output from elf2flt at compile time. > >> > > >> >Thanks for the patch, will try it. > >> > > >> >>>I am not sure any Qemu Cortex-M3/4 system emulation is > >> >>>available. > >> >> > >> >>Do you know of any qemu target machines that work out-of-the-box > >> >>with a stock linux kernel with MMU disabled? > >> > > >> >No. > >> > > >> >>I used to use the gdb/ARMulator many years ago, but the kernel > >> >>target machine (Atmel/at91eb01) is long gone in modern kernel > >> >>version. > >> > > >> >I tried three different qemu forks, but they all only provide > >> >system level emulation for bare-metal apps. Skyeye crashes for me > >> >and recent GDB doesn't contain the old Armulator stuff. > >> > > >> >I tried Qemu mainline to bootup versatilepb/vexpress Linux kernel > >> >without MMU, but get no output. > >> > >> Looking into the other ARM flat problem, I figured we need to get > >> this problem solved as well. > >> > >> Turns out it is not too hard to get a Versatile target built > >> and running on qemu in no-MMU mode. The only real change required > >> is the attached patch - which fixes the IO device addressing problem. > >> > >> With this patch and starting with the versatile_defconfig you > >> only need a couple of config changes and it will run on the > >> versatile target in qemu. You need to disable CONFIG_MMU > >> and set the DRAM sizing (base at 0, size 128MB). > >> > >> This patch is against a linux-4.4 kernel, and it looks like the > >> versatile target has gone device tree from 4.5 and newer - so > >> this patch won't apply or work on them as is. > > > > Can you show us the commandline you use? What -cpu do you use? > > To run qemu I use: > > qemu-system-arm -M versatilepb -nographic -kernel images/zImage -append > "console=ttyAMA0,115200" > > The running system reports: > > CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00091176 > CPU: VIVT data cache, VIVT instruction cache > Machine: ARM-Versatile PB > > So its an ARM926 - but I didn't specify any CPU to qemu, I just > let it default to whatever is the versatilepb qemu default. > > Attached is the linux kernel config I used to generate kernel. > > Note that I have had to make a couple of changes to elf2flt to get > apps working. I'll send some emails about those soon. But that > doesn't affect getting the kernel running on qemu.
I can't get it working. Can you explain what toolchain do you use? gcc version? binutils version? soft-float toolchain? Are you using arm or thumb instructions? Can you show me gcc -v of your cross-compiler? best regards Waldemar _______________________________________________ uClinux-dev mailing list uClinux-dev@uclinux.org http://mailman.uclinux.org/mailman/listinfo/uclinux-dev This message was resent by uclinux-dev@uclinux.org To unsubscribe see: http://mailman.uclinux.org/mailman/options/uclinux-dev
