Messages in this thread |  | | Date | Sat, 7 Sep 2002 19:57:35 +0200 | From | Jurriaan <> | Subject | Lite-On cdwriter detected as 12x instead of 40x |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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