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| mntmn | back on zz9000, i do ~not~ understand why kickstart would not read my ROM when the card is zorro 2 | 22:29 |
|---|---|---|
| mntmn | it reads only 1 word from it | 22:29 |
| mntmn | i mean, 1 word from the er_InitDiagVec | 22:29 |
| mntmn | (in my case, offset 0x6000) | 22:29 |
| _Bnu | If it doesn't find the value it expects there, it'll just return instantly without doing anything. | 22:30 |
| _Bnu | I forget what it's looking for, 90 or something. | 22:31 |
| _Bnu | $90 | 22:31 |
| mntmn | yeah, ok, i mean when i look with mon i have 90 there | 22:31 |
| mntmn | (0x90) | 22:31 |
| mntmn | in the first byte | 22:31 |
| mntmn | i.e. the first word is 0x9000 | 22:31 |
| _Bnu | Then it should be happy... | 22:32 |
| mntmn | TIL about ShowConfig DEBUG | 22:32 |
| mntmn | that shows "ROM diag vec valid", and er_InitDiagVec = $6000 | 22:32 |
| _Bnu | What's the size of the ROM? | 22:34 |
| mntmn | 0x2000 | 22:34 |
| _Bnu | Since it can only be max 64KB total with Zorro 2 like that, that's probably not the issue though. | 22:35 |
| mntmn | but it does not read the rom size | 22:35 |
| mntmn | like, it reads only from 0x6000, but the size is in 0x6002 (+3) | 22:35 |
| _Bnu | Yeah, that's really weird... I remember stepping through the code for this back when I first added it, trying to figure out what the hell it was doing, and the $90 is the only thing I can remember as a complete showstopper... | 22:38 |
| mntmn | :/ | 22:39 |
| mntmn | thanks for confirming, though | 22:39 |
| mntmn | hmm. totally stumped | 22:45 |
| mntmn | ok, found the issue | 22:47 |
| apolkosnik[m] | ;-) 0x90 on x86 is NOP ;-) | 22:50 |
| mntmn | the issue is that ethernet/usb startup take too long | 22:51 |
| mntmn | and the rom reads also go through arm | 22:51 |
| mntmn | but if the first read takes too long it times out or something | 22:52 |
| _Bnu | Ah yeah, I forgot about that. | 22:59 |
| _Bnu | DTACK is invalid for too long, so it gives up. | 22:59 |
| mntmn | yes | 23:00 |
| mntmn | interesting that Z3 tolerates it | 23:00 |
| _Bnu | Z3 has AXIS DMA, though. | 23:00 |
| _Bnu | Axis and Allies. | 23:00 |
| _Bnu | I guess it might be because Z3 is technically async while Z2 isn't. | 23:01 |
| mntmn | hmm that's true. | 23:10 |
| mntmn | ok, i made the zz9000os boot 1 million times faster and that helped | 23:19 |
| mntmn | ahahah column swap bug is back... wow | 23:20 |
| _Bnu | Only one million times! | 23:26 |
| mntmn | yeah that is the minimum... | 23:45 |
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