[U-Boot] [PATCH] mx6: Fix the reading of CPU revision

[Fabio Estevam]

On Wed, Mar 27, 2013 at 5:02 AM, Dirk Behme <dirk.behme at de.bosch.com> wrote:

> I'll check this.
>
> Rethinking about the issue here, my recent understanding is:
>
> a) We have a VPU library which only understands 0x63 (Quad) and 0x61
> (DualLite/Solo)

Correct.

> b) We have Troy's existing get_cpu_rev() [1] which seems to correctly decode
> the CPU revision (at least this is my impression from testing ;) ). But
> reports 0x62 for the Solo which then isn't understood by the VPU library (to
> be checked).

Correct.

> I wonder if we could find a way to combine both parts without breaking the
> other? I.e. using Troy's get_cpu_rev() to correctly report the CPU revision
> (in U-Boot), but let the VPU library get the revision it understands?

Yes, this could be possible. The original patch in this thread fixes
the returned value by get_cpu_rev(), so that we can have mainline
U-boot to boot a system that can use VPU on a mx6solo.

It is still possible to report the CPU revisions
(Quad/Dual-lite/Solo/Solo-lite) strings in boot time. We would need to
add a custom mx6 code for printing the strings.

Regards,

Fabio Estevam