Hello. I'm pretty new to barebox and I'm having some troubles running the qemu64 target. to top it off, I'm also new to the ARM world... and this is my first attempt at looking at a bootloader... I'm having trouble porting some hardware to barebox... and while I'm waiting for a JTAG probe, I though I could have some fun with qemu64 :) The boot stops pretty early in the flow. way before anything can be printed on the serial. I have attached gdb to the qemu-system. The "qemu-system" seems to be stuck when trying to execute an stp with the stack pointer as the destination. I'm having the feeling that I have a configuration issue because sp = 0x0 x27 0x0 0 x28 0x0 0 x29 0x0 0 x30 0x0 0 sp 0x0 0x0 pc 0x40000000 0x40000000 <start> cpsr 0x400003c5 1073742789 fpsr 0x0 0 fpcr 0x0 0 (gdb) disassemble Dump of assembler code for function start: => 0x0000000040000000 <+0>: b 0x40000048 <start+72> 0x0000000040000004 <+4>: nop 0x0000000040000008 <+8>: nop 0x000000004000000c <+12>: nop ... 0x0000000040000048 <+72>: b 0x40013444 <barebox_arm_reset_vector> then we are branching to <barebox_arm_reset_vector> Dump of assembler code for function barebox_arm_reset_vector: => 0x0000000040013444 <+0>: stp x29, x30, [sp, #-16]! 0x0000000040013448 <+4>: mov x29, sp 0x000000004001344c <+8>: bl 0x40000050 <arm_cpu_lowlevel_init> with sp still equals to 0x0. stepping from there seems to get me "stuck"... when interrupting gdb (Ctrl-C) and dumping the registers, I'm getting the feeling I'm out of barebox code with pc equals 0x200 x29 0x0 0 x30 0x0 0 sp 0x0 0x0 pc 0x200 0x200 cpsr 0x3c5 965 fpsr 0x0 0 It's probably some kind of configuration issue...? though I see no code to set sp before that stp instruction. I tried toying with the memory map, setting stack and text base addresses, but it doesn't seem to fix my issue. Or maybe it's okay to decrement sp while it's equal to 0x0? Any ideas? comments? Thx, Guillaume. running qemu: sudo qemu-system-aarch64 -m 4096M \ -cpu cortex-a57 -machine virt \ -display none -serial stdio \ -kernel qemu64/barebox -s -S
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