xorg broken on Beaglebone black revision 300438

[Mark Millard]

Quoting from Otacílio Tue May 24 00:06:10 UTC 2016 and its locore-v6.S changes:

> -    orr    r7, #CPU_CONTROL_UNAL_ENABLE
> -    orr    r7, #CPU_CONTROL_AFLT_ENABLE
> +    bic    r7, #CPU_CONTROL_UNAL_ENABLE
> +    bic    r7, #CPU_CONTROL_AFLT_ENABLE

-r295256 (2016-Feb-14) changed from:

bic     r7, #CPU_CONTROL_UNAL_ENABLE

to:

orr     r7, #CPU_CONTROL_UNAL_ENABLE

in two places (moving it a few lines down for each example as well). So this much of the proposed changes would be reverting the -r295256 change. The check in comment indicates the bit is RAO/SBOP for armv7. For armv6 the check in comment claims it controls armv5 compatible alignment support.

But:

orr     r7, #CPU_CONTROL_AFLT_ENABLE

has been in locore-v6.S since the file's first checkin. So this change to bic here be new.

What is the FreeBSD intent for each of the two new settings for armv7? armv6?


===
Mark Millard
markmi at dsl-only.net