Messages in this thread | | | Date | Wed, 28 Feb 2007 11:04:04 -0600 | From | Timur Tabi <> | Subject | Re: lanana: Add major/minor entries for PPC QE UART devices |
| |
Dan Malek wrote:
> I don't know the origin of this thread, but none of > that looks correct. Today, there can be up to 8 > CPM UART devices, 6 on CPM/CPM2 and 8 > on the QE. If ttyCPM0 starts at minor 46, they > should be at least monotonically incrementing > up to ttyCPM7 with minor 53.
Minor nit: On the QE, they'll be called ttyQE0 through ttyQE7.
I agree that the CPM and the QE should share the same starting minor number, so that ttyCPM0 has the same major/minor number as ttyQE0, since it's not possible to have a CPM and a QE on the same device. However, ttyCPM0 is currently assigned to 46, and device 50 is an Altix serial card. The only way to give the CPM 6 or 8 slots without moving it is to overlap the Altix card.
Now I don't know anything about the Altix card, so I don't know if it's possible to use that card on a system with a CPM or a QE. If it isn't, then I don't know if overlapping minor numbers is still a problem.
(Note that the Altix card has a range of 50-81, which is pretty big.)
If we move CPM/QE to 192, then I can change the CPM device driver to reflect that, but I don't know what that means for older kernels.
-- Timur Tabi Linux Kernel Developer @ Freescale - 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/
| |