[coreboot] The problem of coreboot porting to fu540

[王翔]

I use bbl as the coreboot's payload, bbl can start and running into the enter_supervisor_mode function, but can't continue. 

I added some code to print register state before mret and print memory on target address.
I debugged it for a long time and didn't know where the problem was. hoping to get your help.


Below is my output:

```

mhartid  : 2
mstatus  : 8000000a00006800
mie      : 0000000000000008
mtvec    : 0000000080080004
mscratch : 000000008008cec0
mepc     : 0000000080280000
mcause   : 0000000000000002
mip      : 0000000000000200
sstatus  : 8000000200006000
sie      : 0000000000000000
stvec    : 0000000080280100
sscratch : 0000000000000000
sepc     : ffffffe000927ff8
scause   : 8000000000000005
sip      : 0000000000000200
satp     : 0000000000000000

mhartid  : 1
mstatus  : 8000000a00006800
mie      : 0000000000000008
mtvec    : 0000000080080004
mscratch : 000000008008bec0
mepc     : 0000000080280000
mcause   : 0000000000000002
mip      : 0000000000000200
sstatus  : 8000000200006000
sie      : 0000000000000000
stvec    : 0000000080280100
sscratch : 0000000000000000
sepc     : ffffffe000927ff8
scause   : 8000000000000005
sip      : 0000000000000200
satp     : 0000000000000000

mhartid  : 3
mstatus  : 8000000a00006800
mie      : 0000000000000008
mtvec    : 0000000080080004
mscratch : 000000008008dec0
mepc     : 0000000080280000
mcause   : 0000000000000002
mip      : 0000000000000200
sstatus  : 8000000200006000
sie      : 0000000000000000
stvec    : 0000000080280100
sscratch : 0000000000000000
sepc     : ffffffe000927ff8
scause   : 8000000000000005
sip      : 0000000000000200
satp     : 0000000000000000

mhartid  : 4
mstatus  : 8000000a00006800
mie      : 0000000000000008
mtvec    : 0000000080080004
mscratch : 000000008008eec0
mepc     : 0000000080280000
mcause   : 0000000000000001
mip      : 0000000000000200
sstatus  : 8000000200006000
sie      : 0000000000000000
stvec    : ffffffe000927c74
sscratch : 0000000000000000
sepc     : 0000000080282240
scause   : 0000000000000003
sip      : 0000000000000200
satp     : 0000000000000000

0000000080280000: 73 10 40 10 97 31 d3 00
0000000080280008: 93 81 c1 8d 99 62 73 b0
0000000080280010: 02 10 93 86 01 16 05 46
0000000080280018: af a6 c6 00 d9 ee 2a 84
0000000080280020: ae 84 17 01 d0 00 13 01
0000000080280028: e1 fd ef 20 00 1f ef 00
0000000080280030: 80 02 17 62 d0 00 13 02
0000000080280038: e2 a8 23 24 82 02 17 e1
0000000080280040: cf 00 13 01 21 fc 09 65
0000000080280048: 2a 91 22 85 a6 85 ef 20
0000000080280050: 80 27 6f 00 40 68 9b 05
0000000080280058: f0 ff 93 95 55 02 17 05
0000000080280060: 00 00 13 05 25 fa 89 8d
0000000080280068: ae 90 17 05 00 00 13 05
0000000080280070: 65 03 2e 95 73 10 55 10
0000000080280078: 17 56 db 00 13 06 86 f8
```




------------------



王翔

安全研究员

广州市腾御安信息科技有限公司





广州市天河区珠江新城华穗路406号保利克洛维二期中景A座1020-1024
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