Hello,
I am attempting to boot evb-ast2500 in Qemu before flashing it to a system. It doesn't get past the DRAM step, due to getting stuck endlessly looping in some libfdt code.
With some debugging turned on, I get this:
OF: translating address: 0040781e OF: parent translation for: 00000000 OF: one level translation: 0040781e OF: parent translation for: 00000000 OF: one level translation: 0040781e OF: translating address: 00206e1e
U-Boot 2018.09-rc1-00096-gbb694d4e898b-dirty (Aug 06 2018 - 12:27:22 +0930)
Model: Aspeed BMC DRAM: OF: translating address: 00006e1e OF: translating address: 00026e1e OF: translating address: 0050781e OF: parent translation for: 00000000 OF: one level translation: 0050781e OF: parent translation for: 00000000 OF: one level translation: 0050781e Watchdog timer expired.
And then the watchdog causes the system to reboot. The build is master as of gbb694d4e898b, with the addition of some #define DEBUG.
I don't think this is a qemu issue. If it is, I can work on fixing qemu, but I need some help on understanding what u-boot is doing.
There's a big pause before the U-Boot banner, and again after showing 'DRAM: 'before getting any of the OF messages. If I get gdb to show me a backtrace at this point:
#0 0x0001e858 in __fswab32 (x=<optimised out>) at include/linux/byteorder/swab.h:114 #1 fdt_offset_ptr (fdt=fdt@entry=0x39370, offset=offset@entry=6444, len=len@entry=4) at lib/libfdt/../../scripts/dtc/libfdt/fdt.c:86 #2 0x0001e9b4 in fdt_next_tag (fdt=fdt@entry=0x39370, startoffset=startoffset@entry=6440, nextoffset=0x1e726d44, nextoffset@entry=0x1e726d3c) at lib/libfdt/../../scripts/dtc/libfdt/fdt.c:120 #3 0x0001eae4 in fdt_next_node (fdt=fdt@entry=0x39370, offset=6440, depth=0x1e726d5c, depth@entry=0x1e726d54) at lib/libfdt/../../scripts/dtc/libfdt/fdt.c:176 #4 0x000205cc in fdt_supernode_atdepth_offset (fdt=0x39370, nodeoffset=14748, supernodedepth=0, nodedepth=0x0 <_start>) at lib/libfdt/fdt_ro.c:443 #5 0x00011608 in ofnode_get_parent (node=..., node@entry=...) at include/dm/ofnode.h:94 #6 0x000113dc in regmap_init_mem (node=..., mapp=0x0 <_start>, mapp@entry=0x1e726dbc) at drivers/core/regmap.c:63 #7 0x000014e0 in ast2500_sdrammc_ofdata_to_platdata (dev=0x1e7273c4) at include/dm/read.h:38 #8 0x0000fc88 in device_probe (dev=dev@entry=0x1e7273c4) at drivers/core/device.c:399 #9 0x000108c0 in uclass_get_device_tail (dev=0x1e7273c4, ret=<optimised out>, devp=0x1e726e0c) at drivers/core/uclass.c:397 #10 0x00010900 in uclass_get_device (id=id@entry=UCLASS_RAM, index=index@entry=0, devp=0x1e726e0c, devp@entry=0x1e726e04) at drivers/core/uclass.c:413 #11 0x00001ab0 in dram_init () at arch/arm/mach-aspeed/ast2500-board.c:69 #12 0x0001b834 in initcall_run_list (init_sequence=init_sequence@entry=0x29344 <init_sequence_f>) at lib/initcall.c:30 #13 0x0000854c in board_init_f (boot_flags=<optimised out>) at common/board_f.c:900 #14 0x00000664 in _main () at arch/arm/lib/crt0.S:86
Cheers,
Joel
--
To reproduce in qemu, build qemu master for ARM:
git://git.qemu-project.org/qemu && cd qemu ./configure --target-list=arm-softmmu make
build a 32MB image from u-boot.bin:
dd if=/dev/zero of=test.img bs=1M count=32 dd if=u-boot.bin of=test.img conv=notrunc
boot it:
arm-softmmu/qemu-system-arm -M ast2500-evb -m 512 -nographic -drive file=test.img,format=raw,if=mtd -serial stdio -monitor pty