Raspberry Pi 5: How To info for others

[KickingAnimal]

Hello,
I know this is not the right place/way to give this info but Issues are disabled on this git repo and I like to keep relevant stuff on platform not behind a login wall on another forum :-)

This is meant to help others who also have a Pi 5 and have to root a old Toon 1 via the JTAG way.

As the Pi5 uses a different chip for GPIO and Python2 being deprecated it is a little more difficult to get things working.

most instructions of the original repo can be followed except:
I followed an older commit state:
71c1037

On the Pi 5 install
Rapberry Pi OS: Debian 12 (bookworm) (older won't boot)

Python2 download and compile:

sudo apt update
sudo apt install -y git build-essential autoconf automake libtool pkg-config texinfo \
libusb-1.0-0-dev libgpiod-dev gpiod libffi-dev zlib1g-dev libssl-dev libbz2-dev \
libreadline-dev libsqlite3-dev libncurses5-dev libgdbm-dev uuid-dev tk-dev

cd ~
wget https://www.python.org/ftp/python/2.7.18/Python-2.7.18.tgz
tar xf Python-2.7.18.tgz
cd Python-2.7.18
./configure --prefix=/opt/python2 --enable-unicode=ucs4
make -j$(nproc)
sudo make install
sudo ln -s /opt/python2/bin/python2 /usr/local/bin/python2

cd ~
curl -LO https://bootstrap.pypa.io/pip/2.7/get-pip.py
sudo /opt/python2/bin/python2 get-pip.py "pip==20.3.4"
sudo /opt/python2/bin/pip2 install "pyserial==3.5"

Download and build OpenOCD for LinuxGPIO:

cd ~
git clone --recursive git://git.code.sf.net/p/openocd/code openocd
cd openocd
git fetch --tags
git checkout v0.12.0
git submodule update --init --recursive 
./bootstrap
./configure --enable-internal-jimtcl --enable-linuxgpiod --enable-sysfsgpio --prefix=/usr
make -j$(nproc)
sudo make install

Then because Python2 is not supported well anymore the following lines need to be commented out of main.py. this will disable ssh key generation by the python script.

#import sshkeys
    if args.ssh_public_key:
        with open(args.ssh_public_key, 'r') as f:
            ssh_pubkey_data = f.read()
        #if not sshkeys.check_public_key(ssh_pubkey_data):
        #    raise Exception("RSA key is not valid")
        log.info("Using RSA key in {}".format(args.ssh_public_key))
    #else:
    #    (pub, priv) = sshkeys.generate_key_pair(args.private_key_password)
    #    ssh_pubkey_data = pub
    #    with open("{}".format(args.output_ssh_key), 'w') as f:
    #        f.write(priv)
    #    with open("{}.pub".format(args.output_ssh_key), 'w') as f:
    #        f.write(pub)
    #    log.info("Written private and public key pair to {0} and {0}.pub, respectively".format(args.output_ssh_key))

This change requires manual generation of SSH key:
ssh-keygen -t rsa -b 2048 -f ~/toon_rsa -N ""

Then to use OpenOCD for rpi5 with this script add the following file:
~/ToonRooter/assets/adapters/rpi5.cfg

# SPDX-License-Identifier: GPL-2.0-or-later

# Config for Raspberry Pi 5 used as a bitbang adapter.
# https://www.raspberrypi.com/documentation/computers/raspberry-pi.html

# Raspberry Pi 5 is not compatible with bcm2835gpio native GPIO driver.
# The linuxgpiod driver without configurable adapter speed runs at approximately
# 800 kHz (SWD writes) and 360 kHz (SWD reads)

adapter driver linuxgpiod

proc read_file { name } {
	if {[catch {open $name r} fd]} {
		return ""
	}
	set result [read $fd]
	close $fd
	return $result
}

proc find_rp1_alias {} {
	foreach f [glob -directory "/proc/device-tree/aliases" "gpio\[0-9\]"] {
		if {[string match "*/rp1/*" [read_file $f]]} {
			return $f
		}
	}
}

set pcie_aspm [read_file /sys/module/pcie_aspm/parameters/policy]
if {![string match {*\[performance\]*} $pcie_aspm]} {
	echo "Warn : Switch PCIe power saving off or the first couple of pulses gets clocked as fast as 20 MHz"
	echo "Warn : Issue 'echo performance | sudo tee /sys/module/pcie_aspm/parameters/policy'"
}

set GPIO_CHIP [string index [find_rp1_alias] end]
source [find interface/raspberrypi-gpio-connector.cfg]

you might need to edit the following file for TRST and SRST:
/usr/share/openocd/scripts/interface/raspberrypi-gpio-connector.cfg

# If you define trst or srst, use appropriate reset_config
# Header pin numbers: TRST - 26, SRST - 18

 adapter gpio trst -chip $_GPIO_CHIP 7
 #reset_config trst_only

 adapter gpio srst -chip $_GPIO_CHIP 24
# reset_config srst_only srst_push_pull

# or if you have both connected,
 reset_config trst_and_srst srst_push_pull

for the connections they also differ from the older Pi models:

JTAG |	GPIO |	PI  |	TOON
-----------------------------------
TRST |	7    |	26  |	2
GND  |	     |	25  |	3
TCK  |	11   |	23  |	4
GND  |	     |	20  |	5
TMS  |	8    |	24  |	6
     |	     |	    |
SRST |	24   |	18  |	7
     |	     |	    |
TDI  |	10   |	19  |	8
TDO  |	9    |	21  |	10
     |	     |	    |
RX(t)|	     |	8   |	11
TX(t)|	     |	10  |	13
GND  |	     |	9   |	14

Then run the following. (might have to manually reboot the Toon and/or run the script multiple times.)
sudo python2 . --jtag-hardware rpi5 --ssh-public-key ~/toon_rsa.pub --serial-port /dev/ttyAMA0

For me this was the output after i ran it a 3rd time and rebooted the toon manually when it got to the "Patching Toon" part.

KickingAnimal@raspberrypi-5:~/ToonRooter $ sudo python2 . --jtag-hardware rpi5 --ssh-public-key ~/toon_rsa.pub --serial-port /dev/ttyAMA0
INFO:__main__:Starting up...
INFO:__main__:Using RSA key in /home/dion-frankes/toon_rsa.pub
INFO:rooter:Waiting for Toon to restart
INFO:rooter:Toon has U-Boot version 2010.09-R6
INFO:rooter:Using password to log in
INFO:rooter:Logging in to U-Boot
INFO:rooter:Patching U-Boot
INFO:rooter:Waiting for boot up
INFO:rooter:Transferring payload
INFO:rooter:Patching Toon
INFO:rooter:>>> Enabling root user. Your root password is: [****]
INFO:rooter:>>> Opening ports 22, 80 and 10080 on firewall
INFO:rooter:>>> Disable VPN on boot
INFO:rooter:>>> Installing dropbear
INFO:rooter:>>> Installing openssh-sftp-server
INFO:rooter:Cleaning up
INFO:rooter:Rebooting
INFO:rooter:Your Toon is now rooted. Please wait for it to boot up and try to log in using SSH

hope this might help someone if they find an old Toon like I did