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gaplant (PogoPlug V4)

Table of Contents

Summary

TODO

Notes

  • 3.3V Serial

Hardware

Make Cloud Engines
Year 2011
Model PogoPlug V4
Chassis PogoPlug
Power Supply 12V DC
Processor Kirkwood 88F6281 SoC
  Feroceon 88FR131
Memory 128MB SDRAM
Ports USB A 2.0
  RJ-45 LAN
  DB-9 Serial (modded, 3.3V)
Storage 128MB NAND
Display  
Int. Peripherals  
Ext. Peripherals  
Dimensions  
Length/Depth  
Width  
Height/Thickness  
Weight kg (lbs oz)

Software

Operating System  
Unique applications  

Log

[2022-06-29 Wed] A modern u-boot

According to this doozan thread the V4 could load u-boot over serial.

First trouble was getting the serial port to work. I punched a hole in the case and wired in a DB-9. Went to boot and could only get gibberish no matter the baud (online posts indicated 115200 though). Finally figured it might be 3.3V so I searched and it was. Most sites neglected to mention it for some reason. I probably wouldn't have bothered with the DB-9 since I don't have a 3.3V serial adapter with that connector. Perhaps I can stick a level shifter in there later to make it useful. Continuing with a proper 3.3V adapter:

I tried loading a u-boot image with kwboot, but it just booted the onboard image. I think I missed a flag, but anyway on to building a modern u-boot. 

sudo apt install gcc-10-arm-linux-gnueabi
git clone https://github.com/u-boot/u-boot
cd u-boot
export CROSS_COMPILE=arm-linux-gnueabi-
make pogo_v4_defconfig
make

Then use kwboot (from u-boot-tools) to serial boot the board. 

kwboot -t -B 115200 /dev/ttyUSB0 -b u-boot.kwb -p

Sending boot message. Please reboot the target...\
Sending boot image...
  0 % [......................................................................]
  ...
 98 % [..............................................................]
[Type Ctrl-\ + c to quit]
U-Boot 2022.07-rc5-00034-g05dcb5be50 (Jun 29 2022 - 20:59:11 -0500)
Pogoplug V4

SoC:   Kirkwood 88F6281_A1
Model: Cloud Engines PogoPlug Series 4
DRAM:  128 MiB
Core:  15 devices, 13 uclasses, devicetree: separate
NAND:  128 MiB
MMC:   mvsdio@90000: 0
Loading Environment from NAND... *** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
pcie0.0: Link down
Net:
Warning: ethernet-controller@72000 (eth0) using random MAC address - fa:ke:ma:ca:dd:rs
eth0: ethernet-controller@72000
Hit any key to stop autoboot:  0
starting USB...
Bus ehci@50000: USB EHCI 1.00
scanning bus ehci@50000 for devices... 1 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found
** Bad device specification usb 0 **
Couldn't find partition usb 0:1
Can't set block device
** Bad device specification usb 0 **
Couldn't find partition usb 0:1
Can't set block device
** Bad device specification usb 0 **
Couldn't find partition usb 0:1
Can't set block device
Wrong Image Format for bootm command
ERROR: can't get kernel image!
Pogo_V4>

So we have a working u-boot, but it's not installed to NAND. I haven't been able to boot a kernel yet.

[2022-06-30 Thu] Lets boot something

First thing we need is a rootfs. debootstrap makes this reasonably easy.

As root:
dpkg --add-architecture armel
apt update
mkdir armel_stable_chroot
qemu-debootstrap --arch=armel stable armel_stable_chroot http://deb.debian.org/debian/

This gives us a basic Debian rootfs without a kernel.

Then …

TODO