| Re: [hatari-devel] IDE LBA-48 not working |
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- Subject: Re: [hatari-devel] IDE LBA-48 not working
- From: Uwe Seimet <Uwe.Seimet@xxxxxxxxx>
- Date: Wed, 14 Feb 2024 12:19:04 +0100
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Hi,
Just an additional piece of information: For double-checking I verified
whether HDDRIVER still correctly uses LBA-48, and as far as I can tell it
does: I successfully tested LBA-48 with 3 SATA drives.
This means that there is most likely an issue with Hatari and LBA-48, indeed.
Best regards
Uwe
> Hi Uwe,
>
> On 12.2.2024 22.12, Uwe Seimet wrote:
> > Has anybody successfully tested LBA-48? As far as I can tell it does not
> > work.
>
> Thomas ported Qemu IDE hard disk code in (early) 2009 to Hatari. After
> that, I think most IDE testing (and hard disk image testing in general)
> probably has been done by you...
>
>
> > I created a drive image of about 250 GB and used it for an emulated
> > SCSI drive. With the SCSI drive there were no issues. Then I used the same
> > drive image for IDE and noticed that some of the data written by the SCSI
> > emulation were not present.
> > I investigated further and found that this appears to be related to the
> > LBA-48 mode. The last sector where Hatari returned the same data for (i.e.
> > the same for IDE and for SCSI) was sector 268435455, which is 2^28 - 1. This
> > is the last sector where LBA-28 still works. For sector 268435456 Hatari IDE
> > returns data, at least not those this sector actually contains. Hatari does
> > not even log that the sector was accessed. When writing to this sector it is
> > similar: There is no error, nothing is logged, but the data are not written.
>
> Maybe it's something that was not fully supported by 2009 Qemu code
> ported to Hatari?
>
> Hatari code has e.g. couple of FIXMEs about "HOB" bit handling, which
> may be related to LBA-48 mode handling(?).
>
> Looking at Qemu commit history, that was fixed in Qemu only in 2020:
> https://github.com/qemu/qemu/commit/be8c9423dec7bd0a0af7f57ecbbcb2718db72555
>
> And there's a fix to LBA-28 / LBA-48 detection in 2021:
> https://github.com/qemu/qemu/commit/46e018e9b741731842b93ce23a86fad60445969b
>
> Thomas?
>
>
> - Eero
>
>