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NuttX Crashes When Booting

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Lee Lup Yuen 2023-07-02 13:35:13 +08:00
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@ -1264,6 +1264,26 @@ So we'll simply read the Hart ID from Register A0. (And ignore A1)
TODO: Remove `csrr a0, mhartid`
_What are the actual values of Registers A0 and A1?_
Thanks to our [earlier Crash Dump](https://github.com/lupyuen/nuttx-star64#boot-nuttx-on-star64), we know the actual values of A0 and A1!
```text
EPC: 000000004020005c RA: 00000000fff471c6 TVAL: 00000000f1402573
EPC: ffffffff804ba05c RA: 00000000402011c6 reloc adjusted
SP: 00000000ff733630 GP: 00000000ff735e00 TP: 0000000000000001
T0: 0000000010000000 T1: 0000000000000033 T2: 7869662e6b637366
S0: 0000000000000400 S1: 00000000ffff1428 A0: 0000000000000001
A1: 0000000046000000 A2: 0000000000000600 A3: 0000000000004000
```
This says that...
- Hart ID is 1 (Register A0)
- RAM Address of Device Tree is `0x4600` `0000` (Register A1)
_What about other CSR Instructions in our NuttX Boot Code?_
We change the Machine-Level `m` Registers to Supervisor-Level `s` Registers.