| Re: [hatari-devel] Handling of _drvbits |
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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] Handling of _drvbits
- From: Uwe Seimet <Uwe.Seimet@xxxxxxxxx>
- Date: Sat, 12 Jul 2025 15:52:53 +0200
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> FWIW, that's what I recall from former times: TOS clears the variable at
> one point during startup, that's why we have to set it again via
> OpCode_SysInit().
>
> If you want to use GEMDOS harddisk partitions together with a hard disk
> driver, you're better off using letters from the end of the alphabet for
> your GEMDOS partitions.
In my case there is no need for this work-around, because with Hatari I
launch HDDRIVER from the AUTO folder of drive C:, not from an image. When
configured accordingly, HDDRIVER does not overwrite existing GEMDOS drive
IDs, but assigns the image partitions starting with the first unused drive
in _drvbits. So GEMDOS drives are always first, regardless of the partitions
on any images present.
What I was wondering is why this does not work when booting HDDRIVER from
an image. My guess is that at the time TOS loads the hard disk driver
_drvbits is still empty, so that HDDRIVER assigns partitions starting with C:.
Hatari sets its GEMDOS drive bits later and overwrites _drvbits
unconditionally.
I just wanted to know if somebody can confirm this behavior of TOS/Hatari.
Best regards
Uwe