IDE corruption w/ 48 Bit addressing

IDE corruption w/ 48 Bit addressing

[Felix Domke]

Hi,

i'm having a PPC-405 based board (IBM STB04500 if anyone cares), and i'm
using a Maxtor 6Y200L0, a 200GB harddisk drive.

Obviously this uses 48bit addressing, and i'm using linucppc 2.4.21-pre4
devel. The same bug occurs with 2.4.20 release.

Users report harddisk corruption, and a quick test showed, that data
written to 0x1800000000+x (LBA sector 0xC000000+x/512) is also written
to x. (direct O_LARGEFILE-access to /dev/discs0/disc).

This will of course corrupt the filesystem.

Now my questions:

  - is this a bug in the IDE low-level interface driver?
  - or maybe in the kernel?
  - or maybe fixed in newer versions?
  - why does the corruption start at this lba sector?


User reported that this occurs with different HDD models and brands,
too, but only with 48bit-drives. Everything else works perfectly.

felix


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Re: IDE corruption w/ 48 Bit addressing

[Felix Domke]

> Users report harddisk corruption, and a quick test showed, that data
> written to 0x1800000000+x (LBA sector 0xC000000+x/512) is also written
> to x. (direct O_LARGEFILE-access to /dev/discs0/disc).
OK, update, this was a bit misleading:

when reading from the device, the upper 3 bytes aren't updated in the
right way, so the "previous content" (as specified in the ATA/6 specs)
seem to be invalid and contain, well, wrong content.

felix


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Re: IDE corruption w/ 48 Bit addressing

[Todd Poynor]

Felix Domke wrote:
>
> Hi,
>
> i'm having a PPC-405 based board (IBM STB04500 if anyone cares), and i'm
> using a Maxtor 6Y200L0, a 200GB harddisk drive.
>
> Obviously this uses 48bit addressing, and i'm using linucppc 2.4.21-pre4
> devel. The same bug occurs with 2.4.20 release.

So far as I know the IBM Redwood-5 (STB04xxx) has an ATAPI-5 controller
onboard, which would not support 48-bit addressing and would support a
max of 137GB.  But if you're using an ATA/6 controller then nevermind...


--
Todd


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