highperfocused/ESP-Miner
1
0
Fork 0
mirror of https://github.com/skot/ESP-Miner.git synced 2025-03-17 21:32:52 +01:00
Code Issues Packages Projects Releases Wiki Activity

more details

Browse Source
This commit is contained in:
Skot Croshere 2022-11-17 18:15:17 -05:00
parent 32e3d038d5
commit e1c0dc542c
1 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
bm1397_protocol.md
View File

@ -1,4 +1,5 @@
##BM1397 protocol
## BM1397 protocol
notes from sniffing BM1397 communication and trying to match it up with cgminer
It looks like this setting up the BM1397:
```
@ -37,7 +38,15 @@ How does this big work field break down?
`04` -> midstates
`00 00 00 00` -> always zero. Is this the starting nonce?
`72 E7 07 17` -> nbits
`A9 81 51 63` -> ntime
`A9 81 51 63` -> ntime. if you flip the endianess, this is unixtimestamp for Thu Oct 20 2022 17:13:13 GMT. boom!
`EE D6 E5 43` -> last 4 bytes of the merkle root
`35 3F 14 92 56 25 54 19 4E 41 31 08 E5 D7 89 4A C8 13 50 A4 48 05 B8 0E E2 E4 83 95 F8 C1 15 8D` -> midstate computed from the first 64 bytes of the header
`EC 07 D8 B8 AE CA DE E6 35 8C 3E E9 1C 57 5D 99 A7 52 95 DC D8 08 7B 7A D` -> ?? another midstate?
when the BM1397 finds a nonce that makes a hash below the difficulty (which difficulty is that?) it responds with;
```
AA 55 00 03 EA 0F 02 20 9C
```
this means the Nonce 0003ea0f was found for JobID 20
If the BM1397 _doesn't_ find a good nonce in the whole nonce space, it just goes off into lalaland. It's up to the miner to keepm track of what the ASIC is doing and send it more work if this happens. If you look at the hashing frequency you should be able to time this.