Difference between revisions of "DHT-Walnut"

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* two pci slots, keyed for 5V only cards
* two pci slots, keyed for 5V only cards
* Promise Technologies [[PDC20265]] IDE
* Promise Technologies [[PDC20265]] IDE
* 512k of boot flash AMD 29LV040B [[[Media:amd29lv040b.pdf]] datasheet]
* 512k of boot flash AMD 29LV040B [[Media:amd29lv040b.pdf]] datasheet
* 12v dc powered
* 12v dc powered
* PPC40XX [[JTAG]] on J10
* PPC40XX [[JTAG]] on J10

Revision as of 14:21, 4 June 2007

DHT-Walnut is a shortened name for the Digital Home Technologies PCB 01070201 Rev. 1.1. The DHT-Walnut board is based on the AMCC-Walnut (still available, and still expensive :P). It is a more improved board described at www.amcc.com. A "walnut" searching will inform about schematic and software. Also keep attention @ DENX: they have developed a lot for the AMCC-Walnut board, and you could find a linux patch for your problem, prettier documentation, developer suit, and much more: in case, you are suggested to have a look to their web pages.

currently available HERE Oops, sold out 2/6/2006

The board consists of:

  • PowerPC 405GP running at 266mhz
  • PC133 SDRAM slot, currently, only supports single sidded DIMMs
  • On-chip 405GP ethernet, board doesn't have an ethernet MAC address
  • DCE serial port, speeds up to 230k, only tested to 115200
  • two pci slots, keyed for 5V only cards
  • Promise Technologies PDC20265 IDE
  • 512k of boot flash AMD 29LV040B Media:amd29lv040b.pdf datasheet
  • 12v dc powered
  • PPC40XX JTAG on J10
  • 6.00" x 7.5" board size

The system's most common configuration seems to be:

  • System PCB
  • 32M PC133 SDRAM DIMM
    • Unknown PCI IEEE-1394 card supported by OHCI driver
    • PPCBoot v.1.1.2 in flash

Hardware that is known to work (and not to work) with this board can be found [wiki:DHT-Walnut-Known-Working-Hardware here]

GPSFan (Freenode IRC on #edev) was helpful in providing an image of the board:


Some info in the pdf HERE

Experimental hack to set a hardware breakpoint inside OCD Commander [[[Media:hardbreak.tgz]] hardbreak.tgz]

  • OCD Commander macro file to dump the CPU configuration (all but PCI) [[[Media:dump_config.mac]] dump_config.mac]
  • OCD Commander macro file to configure the system for recovery [[[Media:recovery_config.mac]] recovery_config.mac]
  • CPU configuration of the system after a warm reset [[[Media:warm_reset.config]] warm_reset.config]
  • CPU configuration of the system once ppcboot v1.1.2 is up and running [[[Media:ppcboot.config]] ppcboot.config]
  • CPU configuration of the system once ppcboot v1.1.6 is up and running [[[Media:ppcboot_116.config]] ppcboot_116.config]
  • Example OCD logfile of the using the recovery macro to load ppcboot [[[Media:ocd_recovery_log.txt]] ocd_recovery_log.txt]
  • Example console log from ppcboot v.1.1.6 running from ram after recovery macro [[[Media:ocd_recovery_console_log.txt]] ocd_recovery_console_log.txt]


  • ppcboot
Here is the latest ppcboot 1.1.6 patch, as is, it will build for flashing at 0xfff80000 as a replacement for the pcboot-1.1.2 that comes with the board.
[[[Media:patch-ppcboot-1.1.6-km2]] patch-ppcboot-1.1.6-km2]
Original sources for ppcboot: [1]
Here is a binary for those without a toolchain.
[[[Media:ppcboot1.1.6.1.bin]] ppcboot1.1.6.1.bin] crc = 083fb0a3
To use this (at your own risk) see the detailed update procedure description: [wiki:DHT-WalnutInstallingTheUpdatedBootloader Installing the Updated Bootloader]
  • U-Boot
U-Boot is a significantly updated replacement for ppcboot.  See: [wiki:DHT-Walnut-U-Boot U-Boot for the DHT-Walnut].

Just in case you make a brick, there is hope: [wiki:DHT-WalnutJtagBootloaderInstallation JTAG Bootloader Installation]

Linux Kernels

  • Version 2.4
(Mostly) working kernel binary and config from jbevren with matrox fbcon and usb input support.
Current issues:
  • Version 2.6
See: [wiki:DHT-Walnut2.6LinuxKernel 2.6 Linux kernel for the DHT-Walnut].


  • [wiki:DHT-Walnut-DebianInstall Debian GNU/Linux netboot installer] -- Install Debian from the internet to a hard disk.


  • How To [wiki:DHT-WalnutInstallingTheUpdatedBootloader replace the bootloader with ppcboot 1.1.6]
  • How To [wiki:DHT-Walnut-U-Boot replace the bootloader with U-boot 1.1.4]
  • How To [wiki:DHT-WalnutJtagBootloaderInstallation recover from "Brickage"]
  • How To [wiki:DHT-WalnutAddJ10 add the JTAG connector at J10]
  • How To [wiki:DHT-WalnutBootViaTftp boot via tftp]
  • How To [wiki:DHT-WalnutBootingFromHdd boot from Hard Disk]
  • How To [wiki:DHT-WalnutUsefullProjects do something useful with your board]
  • How To [wiki:DHT-WalnutGPIO control the Green Media LED and J5]
  • More to come...