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DFL-200 » History » Version 17

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Gordon Shumway, 09/17/2012 03:04 PM


DFL-200

This page is a work in progress and changes as the hardware is mapped out.

Parts:
SoC 26MHz Intel IXP422BB
RAM 64M Hynix HY57V281620ETP-H
Flash 4M Intel JS28F320
Ethernet controller 1 Realtek RTL8100B
2 IXP422 Built-in MAC
Switch 1 Realtek RTL8305SB
IDE controller 1 Promise PDC20275
RTC Ricoh RS5C372A
Features:
10/100 Eth 6 1 on the RTL8100B (WAN)
1 on NPE-C connected to the switch (DMZ)
4 on NPE-B connected to the switch, PHY 32(LAN)
LEDs 1 GPIO-controlled Status LED (LED20)
(plus Ethernet port LEDs controlled by the switch)
BTNs 1 GPIO, Reset button on the rear panel (RSW1), active low
GPIO 4 On GPIOA1; 2 of these are the IIC bus
CF 1 On the IDE controller
RTC 1 With battery backup; on the IIC bus
JTAG 2 1 standard 20-pin ARM JTAG (JB1)
1 unknown (DEBUG2), possibly the DSP engine
Serial 1 RS-232 on the rear panel

The board has unpopulated space for two more SDRAMs and a Mini-PCI Type III connector (some supporting parts may be missing).

The board comes with RedBoot custom-tailored to run Clavister's second-stage loader and OS from the CF card.

RedBoot is scattered over a total of 512K of the 4M flash.

GPIO setup

GPIO Function Note
0
1
2
3
4
5 GPIO5 On GPIOA1
6 IIC SCL Also on GPIOA1
7 IIC SDA Also on GPIOA1
8
9 PCI INTA PDC20275 verify me!
10 PCI INTB RTL8100B verify me!
11
12 Rear-panel Reset button (RSW1) Active low
13 IO reset probably;
connected to switch #RESET pin
also resets the PCI bus
14 GPIO14 On GPIOA1
15 Status LED (LED20) (probably? Supposed to be the PCI clock?)

GPIOA1 header

Pin Function
1 GPIO14
3 IIC SDA
5 IIC SCL
7 GPIO5
2, 4, 6, 8 GND

RedBoot

Console is 9600,8N1.

Flash layout:

Name FLASH addr Mem addr Length Entry point
RedBoot 0x50000000 0x50000000 0x00040000 0x00000000
mac 0x50040000 0x10000000 0x00020000 0x10000000
FIS directory 0x503E0000 0x503E0000 0x0001F000 0x00000000
RedBoot config 0x503FF000 0x503FF000 0x00001000 0x00000000

RedBoot comes up with a default menu that allows selecting between booting the Clavister OS (this is done automatically after a timeout) or enter the RedBoot command line.

Although RedBoot is able to write configuration to flash memory, it ignores (at least some of the) settings contained there (console_baud_rate). The flash config doesn't contain the NPE MAC addresses either. Make note of your MAC addresses from the original OS. They may also be printed on stickers on the Ethernet jacks.

Automatic booting

Booting the Clavister OS is done by the following command sequence:

load -m disk -b 0x100000 hda1:FWLOADER.CFX
go -c 0x101028

This will load FWLOADER.CFX from the first CF partition, which must be either FAT (16?) or ext2fs. Any file named FWLOADER.CFX can be loaded as long as it satisfies the following (known) constraints:

  • Begins with a 4136-byte long DOS/PE stub (it must be a proper DOS/PE stub, at least to some as-of-yet-unknown extent)
  • The payload after the stub must be a tagged image (ie. ELF)

Miscellaneous notes

If GPIO5 is grounded when power is applied, the board enters some sort of a simple self-test routine.

JP2 supplies Vref to the ARM JTAG.

RSW2 is the system reset button (apparently the same as the nSRST JTAG signal).