BBB MMC / SD detection instability with U-Boot 2014.04 (CPU 1GHz)

[Winston Smith]

On Mon, May 19, 2014 at 10:28 PM, Warner Losh <imp at bsdimp.com> wrote:
> Wow! That’s a lot of added 10ms delays…  Do we have a theory of the crime
> for why they are needed? Usually they suggest to me that we’re doing something
> wrong (either not checking the right bits in the bridge, having a fixed retry count
> rather than a timed limit and having some bridges fail more slowly than others
> so the delays are effecting the same thing).

It's a good start (since the BBB is really flakey at 1Ghz), but yes,
more delays aren't good!

For what it's worth, I'm working in parallel with both FreeBSD and
Debian Wheezy images on the BBB, and it is quite apparent that the BBB
running FreeBSD is *much* slower to boot than the BBB running Debian;
which currently boots to the login prompt in about 15 seconds from
power up.  FreeBSD has a 15-20 second delay just to detect the eMMC,
let alone everything else.

Comparatively, my x64 FreeBSD VM boots much more quickly than my Ubuntu x64 VM.

-W.