U-Boot (aarch64) on Qemu を動作させたい (5)
u-boot.bin をダンプすると、 init_sequence_f のアドレスには関数ポインタが格納されていることを確認した。
0004cb70 1c 07 09 00 00 00 00 00 48 9c 09 00 00 00 00 00 |........H.......| 0004cb80 00 08 09 00 00 00 00 00 38 2d 08 00 00 00 00 00 |........8-......| 0004cb90 d4 08 09 00 00 00 00 00 08 08 09 00 00 00 00 00 |................| 0004cba0 b8 08 09 00 00 00 00 00 34 34 08 00 00 00 00 00 |........44......| 0004cbb0 e8 4e 0b 00 00 00 00 00 44 27 09 00 00 00 00 00 |.N......D'......|
(gdb) p setup_mon_len
$1 = {int (void)} 0x9071c <setup_mon_len>
(gdb) p initf_malloc
$2 = {int (void)} 0x99c48 <initf_malloc>
(gdb) p initf_console_record
$4 = {int (void)} 0x90800 <initf_console_record>
と、ここで気づいたが、エラーになるからと、 u-boot.bin ではなく、 u-boot (elf) を -kernel に渡していたが、結構ファイルサイズが違うことに気づく。
もしかして、と、 u-boot の init_sequence_f あたりをダンプすると、
0005cb70 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| * 0005cd70 00 00 00 00 00 00 00 00 01 00 00 00 01 00 00 00 |................| 0005cd80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 0005cd90 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................| 0005cda0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
なんか、すごく見覚えがあるデータ配置 (ところどころの 1 具合が) 出たので、間違いない気がする。
CONFIG_REMAKE_ELF を追加して、 u-boot.elf を作成し、同じアドレスをダンプすると、
0005cb70 1c 07 09 00 00 00 00 00 48 9c 09 00 00 00 00 00 |........H.......| 0005cb80 00 08 09 00 00 00 00 00 38 2d 08 00 00 00 00 00 |........8-......| 0005cb90 d4 08 09 00 00 00 00 00 08 08 09 00 00 00 00 00 |................|
となり、期待通りの結果になった！
エラーは残っているものの、無事、 U-Boot (aarch64) on Qemu を動作させることができた。 u-boot / qemu の動作およびデバッグについてもいい勉強になった。
U-Boot 2016.09-dirty (Oct 10 2017 - 04:57:49 +0900) [51/18819] DRAM: 960 MiB RPI 3 Model B (0xa32081) MMC: bcm2835_sdhci: 0 Card did not respond to voltage select! ** Bad device mmc 0 ** Using default environment In: serial Out: lcd Err: lcd Net: Net Initialization Skipped No ethernet found. starting USB... USB0: Core Release: 0.000 SNPSID invalid (not DWC2 OTG device): 00000000 Port not available. Hit any key to stop autoboot: 0 Card did not respond to voltage select! starting USB... USB0: Core Release: 0.000 [25/18819] SNPSID invalid (not DWC2 OTG device): 00000000 Port not available. No ethernet found. missing environment variable: pxeuuid missing environment variable: bootfile Retrieving file: pxelinux.cfg/00000000 No ethernet found. missing environment variable: bootfile Retrieving file: pxelinux.cfg/0000000 No ethernet found. missing environment variable: bootfile Retrieving file: pxelinux.cfg/000000 No ethernet found. missing environment variable: bootfile Retrieving file: pxelinux.cfg/00000 No ethernet found. missing environment variable: bootfile Retrieving file: pxelinux.cfg/0000 No ethernet found. missing environment variable: bootfile Retrieving file: pxelinux.cfg/000 [4/18819] No ethernet found. missing environment variable: bootfile Retrieving file: pxelinux.cfg/00 No ethernet found. missing environment variable: bootfile Retrieving file: pxelinux.cfg/0 No ethernet found. missing environment variable: bootfile Retrieving file: pxelinux.cfg/default-arm-bcm283x No ethernet found. missing environment variable: bootfile Retrieving file: pxelinux.cfg/default-arm No ethernet found. missing environment variable: bootfile Retrieving file: pxelinux.cfg/default No ethernet found. Config file not found starting USB... USB0: Core Release: 0.000 SNPSID invalid (not DWC2 OTG device): 00000000 U-Boot> print arch=arm baudrate=115200 board=rpi board_name=3 Model B board_rev=0x8 board_rev_scheme=1 board_revision=0xA32081
ただ、 UART については raspi3 で有効になる CONFIG_BCM283X_MU_SERIAL の動かし方がわからないので CONFIG_PL01X_SERIAL を有効にしてしのいでいる。
/* Console UART */ #ifdef CONFIG_BCM2837 -#define CONFIG_BCM283X_MU_SERIAL +#define CONFIG_PL01X_SERIAL #else #define CONFIG_PL01X_SERIAL #endif
