Given the value discovered is what is reported.
You may need to issue a mode/capablities page change.
You need to as Jens Axboe about this, he is more updated than me.
On Sat, 7 Sep 2002, Jurriaan wrote:
> I have a LITE-ON LTR-40125W cdwriter, which can write at 40x.
> The kernel sees it as 12x. This happens in 2.4.19ac4 up to
> 2.4.20pre4ac2, I didn't test later kernels due to the instable IDE
> situation. It has the latest firmware (WS05) - I'm not sure if bothering
> the manufacturer about this is worth it.
>
> If I don't pass the drive on to ide-scsi, and patch
> drivers/ide/ide-cd.c with this small patch,
>
> + /* brain-dead LiteOn model reports itself as 12x */
> + if ((cap != NULL) && (strcmp (drive->id->model, "LITE-ON LTR-40125W") == 0))
> + cap->maxspeed = htons(40 * 176);
>
> all is well, and the kernel reports 40x.
>
> But I can't find out where to put this for the ide-scsi part.
> All the probing routines in drivers/scsi/ide-cd.c seem to access some
> sort of atapi-buffer that already exists. I can tweak it to display 40x
> in the bootup-messages by changing the idescsi_transform_pc? functions
> in drivers/scsi/ide-cd.c:
>
> + if (strcmp (drive->id->model, "LITE-ON LTR-40125W") == 0)
> + {
> + int n = scsi_buf[3] + 4;
> + scsi_buf[n+8] = scsi_buf[n+14] = (u8) ((40 * 176) >> 8);
> + scsi_buf[n+9] = scsi_buf[n+15] = (u8) ((40 * 176) & 0xff);
> + printk("ide-scsi.c: LITE-ON tweak activated\n");
> + }
>
> but that doesn't fool cdrdao nor cdrecord - they still think the drive
> is 12x.
>
> Can anyone help me by pointing out where I should tweak the kernel to
> get correct results when using ide-scsi with my drive?
>
> Thanks,
> Jurriaan
> --
> Remember, Unix on some machines is nUxi.
> GNU/Linux 2.4.19-ac4 SMP/ReiserFS 2x1402 bogomips load av: 0.39 0.28 0.11
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Andre Hedrick
LAD Storage Consulting Group
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