rpi-4: investigate eeprom bootloader upgrade support

[wfleurant]

tested on rpi-4 -- related to [#81]

root@OpenWrt:/tmp# vcgencmd bootloader_config
BOOT_UART=0
WAKE_ON_GPIO=1
POWER_OFF_ON_HALT=0
FREEZE_VERSION=0                                                                 

[wfleurant]

suspicious... i dont want to package blobs but we need a way to update because of overheating. we got thoughts..?

what is this license??
https://github.com/raspberrypi/rpi-eeprom/blob/master/LICENSE

do we make a mm-toolbox/rpi-4-eeprom package?

root@OpenWrt:/tmp/rpi-eeprom# ./rpi-eeprom-config  ./firmware/beta/pieeprom-2020-06-03.bin
[all]
BOOT_UART=0
WAKE_ON_GPIO=1
POWER_OFF_ON_HALT=0
DHCP_TIMEOUT=45000
DHCP_REQ_TIMEOUT=4000
TFTP_FILE_TIMEOUT=30000
ENABLE_SELF_UPDATE=1
DISABLE_HDMI=0
BOOT_ORDER=0xf41

root@OpenWrt:/tmp/rpi-eeprom# ./rpi-eeprom-update
BCM2711 detected
Dedicated VL805 EEPROM detected
*** UPDATE REQUIRED ***
BOOTLOADER: update required
CURRENT: Tue Sep 10 10:41:50 UTC 2019 (1568112110)
 LATEST: Thu Apr 16 17:11:26 UTC 2020 (1587057086)
 FW DIR: /lib/firmware/raspberrypi/bootloader/critical
VL805: update required
CURRENT: 00013701
 LATEST: 000137ad

root@OpenWrt:/tmp/rpi-eeprom# ./rpi-eeprom-update -d -f  ./firmware/beta/pieeprom-2020-06-03.bin
BCM2711 detected
Dedicated VL805 EEPROM detected
BOOTFS /boot
*** INSTALLING ./firmware/beta/pieeprom-2020-06-03.bin  ***
BOOTFS /boot
EEPROM update pending. Please reboot to apply the update.

[wfleurant]

may be this is already taken care of -- i am getting confused with espressobin perhaps?

[    0.000000] ARM_SMCCC_ARCH_WORKAROUND_1 missing from firmware
[    0.024021] raspberrypi-firmware soc:firmware: Attached to firmware from 2020-04-15 11:41, variant start
[    0.028029] raspberrypi-firmware soc:firmware: Firmware hash is 1103ec16df2571274600b377411499bf5aed6d0d
[    0.151999] raspberrypi-clk firmware-clocks: CPU frequency range: min 600000000, max 1500000000