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Don't seek to track -1 on homing (it appears to upset 8" drives). Detect which

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drives are present, so that if only a single drive is attached then it's always
track 0, regardless of which connector it's on.
This commit is contained in:
David Given
2020-02-24 21:47:40 +01:00
parent 04c09d1a5b
commit c47a563790
3 changed files with 295 additions and 262 deletions
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21
doc/building.md
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@@ -225,12 +225,21 @@ You should now have a working board, so it's time to test it.
are cheap and just have the 3.5" connectors. Some are _very_ cheap and
have a single 3.5" connector, after the twist.)
FluxEngine uses, sadly, non-standard disk numbering (there are reasons).
Drive 0 is the one nearest the motherboard; that is, before the twist.
Drive 1 is the one at the end of the cable; that is, after the twist.
Drive 0 is the default. If you only have one drive, remember to plug the
drive into the connector _before_ the twist. (Or you can tell the client
to select drive 1 by using `-s :d=1`.)
If you have **two** drives, plug them into both connectors. FluxEngine,
sadly, non-standard disk numbering (there are reasons). Drive 0 is the
one nearest the motherboard; that is, before the twist. Drive 1 is the
one at the end of the cable; that is, after the twist. Drive 0 is the
default. You can tell the client to select drive 1 by using `-s :d=1`.
If you have **one** drive, you may plug it into _either_ connector.
FluxEngine will autodetect it and treat it as drive 0. However, you'll
get the most reliable electrical signal if you plug it in at the end of
the cable.
**A note on termination:** some 5.25" drives require jumper configuration
to tell them whether they're at the end of the cable or in the middle of
the cable. 3.5" drives don't, and my 5.25" drives don't, so I can't
advise there. Consult your drive datasheet for details.
3. **Important.** Make sure that no disk you care about is in the drive.
(Because if your wiring is wrong and a disk is inserted, you'll corrupt