On 08/06/2018 05:25 AM, Joel Stanley wrote: > 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.
The sdram driver in U-Boot uses the watchdog1 and the SCU power reset register to reset the SDRAM controller. Our QEMU emulation is not precise enough I think. C. > > 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 > _______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
