openWB Forum

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If you want to use RasPiKey on Raspberry Pi 4, you may (or may not) need to update its bootloader first. It depends on the Raspberry Pi 4 you have: earlier batch of Raspberry Pi 4 may have rather old bootloader, which could not recognize RasPiKey. If your Raspberry Pi 4 is recently purchased, then most probably you don't need to update its bootloader, and it can be directly boot with RasPiKey.

We create this ZIP package to ease the procedure of updating Raspberry Pi 4's bootloader. We use the "pieeprom-2020-09-03.bin" file and rename it to "pieeprom.upd", and also rename the "vl805-000138a1.bin" file to "vl805.bin". You can find these files in this package:

pieeprom.sig
pieeprom.upd
recovery.bin
vl805.bin
vl805.sig

Please copy these files to the a micro SD card, and insert it into your Raspberry Pi 4. Connect power supply to your Raspberry Pi 4 and wait for a few seconds, until the green LED on Raspberry Pi blinks 4 times quickly and then stays on. Now the bootloader on your Raspberry Pi 4 has been updated, and you can use RasPiKey on it.

UUGear s.r.o.
2020.12.05

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pi@openWB:~ $ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
NAME="Raspbian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
VERSION_CODENAME=stretch
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

pi@openWB:~ $ cat /sys/firmware/devicetree/base/model
Raspberry Pi 2 Model B Rev 1.1pi@openWB:~ $

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pi@openWB:~ $ sudo cat /sys/kernel/debug/mmc0/ios
clock:          52000000 Hz
actual clock:   50000000 Hz
vdd:            21 (3.3 ~ 3.4 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      2 (4 bits)
timing spec:    1 (mmc high-speed)
signal voltage: 0 (3.30 V)
driver type:    0 (driver type B)

pi@openWB:~ $ sudo apt update
pi@openWB:~ $ sudo apt full-upgrade

pi@openWB:~ $ sudo cat /sys/kernel/debug/mmc0/ios
clock:          52000000 Hz
actual clock:   50000000 Hz
vdd:            21 (3.3 ~ 3.4 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      2 (4 bits)
timing spec:    1 (mmc high-speed) => sollte lauten: timing spec: 8 (mmc DDR52)
signal voltage: 0 (3.30 V)
driver type:    0 (driver type B)