Difference between revisions of "DHT-Walnut"

Revision as of 03:37, 5 June 2007

other DHT-Walnut pages: DHT-Walnut-flameman

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

Bootloaders

• 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.

patch-ppcboot-1.1.6-km2

Original sources for ppcboot: [1]

Here is a binary for those without a toolchain.

ppcboot1.1.6.1.bin crc = 083fb0a3

To use this (at your own risk) see the detailed update procedure description: 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:

• • USB keyboard input doesnt seem to work, but events reach /dev/input/event0
  • Media:uImage
  • Media:config

• Version 2.6

See: 2.6 Linux kernel for the DHT-Walnut

Userland

• Debian GNU/Linux netboot installer -- Install Debian from the internet to a hard disk.

How-To's

• How To replace the bootloader with ppcboot 1.1.6
• How To replace the bootloader with U-boot 1.1.4
• How To recover from "Brickage"
• How To add the JTAG connector at J10
• How To boot via tftp
• How To boot from Hard Disk
• How To do something useful with your board
• How To control the Green Media LED and J5
• More to come...