Multiple firmware fixes needed for kernel updates.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

This is needed to add support for CM4 and RPI 400.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

This updates to the last firmware version before the switch to building
from the common firmware branch, which introduces various issues.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>

This reverts commit 9e467a76.

The Raspberry Pi firmware recently switched to building from the common
firmware branch. This introduces changes in the core clock handling,
causing various issues.

E.g. enable_uart=1 no longer fixes the core clock frequency to 250MHz.
When the disable-bt DT overlay is not loaded, the core clock frequency
is increased to 400MHz. As a result, the UART baud rate is no longer
correct, and this causes garbled serial console, or communication
problems with HATs that use the UART.

As a workaround, the core clock could be fixed to 250MHz by adding
'core_freq=250' in /boot/config.txt, but as there appear to be other
issues than just the UART being broken, the safer bet is to revert the
firmware for now.

Upstream bug: https://github.com/raspberrypi/firmware/issues/1376



Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

This change makes the names of Broadcom targets consistent by using
the common notation based on SoC/CPU ID (which is used internally
anyway), bcmXXXX instead of brcmXXXX.
This is even used for target TITLE in make menuconfig already,
only the short target name used brcm so far.

Despite, since subtargets range from bcm2708 to bcm2711, it seems
appropriate to use bcm27xx instead of bcm2708 (again, as already done
for BOARDNAME).

This also renames the packages brcm2708-userland and brcm2708-gpu-fw.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>