Fixes #721

Fixes #733

Fixes #710.

Fixes #709

This reverts commit 1ccd24df.

This commit probably causes problems with some flash chips:

http://patchwork.ozlabs.org/patch/549173/
http://patchwork.ozlabs.org/patch/553683/

Fixes unwriteable flash when the bootloader leaves it protected.

Original commit message:

    MIPS: ath79: make bootconsole wait for both THRE and TEMT

    This makes the ath79 bootconsole behave the same way as the generic 8250
    bootconsole.

    Also waiting for TEMT (transmit buffer is empty) instead of just THRE
    (transmit buffer is not full) ensures that all characters have been
    transmitted before the real serial driver starts reconfiguring the serial
    controller (which would sometimes result in garbage being transmitted.)
    This change does not cause a visible performance loss.

    In addition, this seems to fix a hang observed in certain configurations on
    many AR7xxx/AR9xxx SoCs during autoconfig of the real serial driver.

    A more complete follow-up patch will disable 8250 autoconfig for ath79
    altogether (the serial controller is detected as a 16550A, which is not
    fully compatible with the ath79 serial, and the autoconfig may lead to
    undefined behavior on ath79.)

Patch tested on v2016.1.x branch with Freifunk Magdeburg firmware on
Debian Jessie amd64 Xen host. See the same patch in our gluon fork here:
https://github.com/FreifunkMD/gluon/blob/fix-sysupgrade-xen/patches/openwrt/0058-x86-fix-platform_export_bootpart-for-Xen-virtual-disks.patch



Sysupgrade was tested successfully by manually making the change before
upgrading in the filesystem of the running node and upgrading to the
fixed FFMD experimental build in config mode via expert settings in
webgui.

Patch also submitted to OpenWRT trunk already.

Signed-off-by: Alexander Dahl <alex@netz39.de>

Backport of rr46271 and r46922.

Based-on-patch-by: Julian Kornberger <jk+github@digineo.de>

We use our own firmware package.

We got most of our patches backported by upstream :)

Backport of r48279

fix rescue mode on wdr4900

Backport of r48793

brcm2708-gpu-fw: move pkg build dir to kernel build dir to fix rebuild bugs after cleaning the kernel tree

Backport of r48732

The bootloader of AirOS 5.6.x doesn't remove the flash protection for us,
so we have to do this ourselves.

This should fix problems with flashing from AirOS 5.6.x.

Backport of r47591 and r48427

Should be redundant after 0bd0df6f

Signed-off-by: Felix Kaechele <felix@kaechele.ca>

We're too close to the release of Gluon 2016.1 to do a full update of our
OpenWrt tree, therefore just make a backport of this.

Also remove the BROKEN check as the UniFi Outdoor Plus support seems to
work fine now.

Fixes #272

Fixes #177