[PATCH v4 32/45] fs: fat: Support reading from a larger block size

[Simon Glass]

Hi Bin,

On Sun, 16 Jul 2023 at 09:19, Bin Meng <bmeng.cn at gmail.com> wrote:
>
> Hi Simon,
>
> On Sun, Jul 16, 2023 at 7:42 AM Simon Glass <sjg at chromium.org> wrote:
> >
> > Hi Bin,
> >
> > On Thu, 13 Jul 2023 at 04:49, Bin Meng <bmeng.cn at gmail.com> wrote:
> > >
> > > Hi Simon,
> > >
> > > On Mon, Jun 19, 2023 at 8:02 PM Simon Glass <sjg at chromium.org> wrote:
> > > >
> > > > At present it is not possible to read from some CDROM drives since the
> > > > FAT sector size does not match the media's block size. Add a conversion
> > > > option for this, so that reading is possible.
> > >
> > > I am completely confused. The CDROM uses iso9660 file system. This has
> > > nothing to do with FAT.
> >
> > It actually can use both - this is the -cdrom option in QEMU which can
> > emulate an old-style CDROM, with a FAT filesystem on it!
> >
>
> What QEMU command line is this to enable a CDROM with FAT file system?
>
> If that is the case, what you changed in this commit only works with
> QEMU, not with any real-world devices, I believe?
>
> Could you use iso9660 instead?

Sure, but the image I am using has an MSDOS partition name, an EFI
partition table, a FAT filesystem and an ISO9660 filesystem! I was
trying to look at the FAT filesystem via the MSDOS partition table.

Regards,
Simon