• CPU: Intel XScale IXP425
  • 533 MHz
  • 2*256 MB SDRAM
    • http://www.newlife-tech.com/doc/p2v56s_0btp11_07024.pdf
    • P2V56S40BTP-G6 (4-BANK x 4,194,304-WORD x 16-BIT)
  • 16 MB Flash für BootROM (StrataFlash)
  • XScale-IXP4xx/IXC11xx [690541f1] revision 1 (ARMv5TE)
  • Developer’s Manual http://download.intel.com/design/intelxscale/27347302.pdf
• Machine: Intel IXDP425 Development Platform
  • Plattform Information http://ecos.sourceware.org/boards/ixdp425.html
  • Product Brief http://www.digchip.com/data/227/227-04723-0-IXDP425.pdf
• Memory: 128MB = 128MB total
• IXP425 Flash: Found 1 x 1MiB AMD AM29LV800BT at 0x0
  • ab 0x50000000
• NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 (Samsung NAND 64MiB 3,3V 8-bit)

• 20 Pin JTAG
• 4 Pin TTY - ttyS1,115200
• Mini PCI

SPEED: 1000KHz TAP:

Info : JTAG tap: ixp42x.cpu tap/device found: 0x19277013 (mfg: 0x009, part: 0x9277, ver: 0x1)

cfg + :

adapter_khz 1000
reset_config trst_and_srst

Beispiel-Konfiguration für OpenOCD (fehlerhaft):

source [find interface/buspirate.cfg]

source [find target/ixp42x.cfg]


buspirate_vreg 0

buspirate_mode open-drain

buspirate_pullup 1

buspirate_port /dev/tty.usbserial-A700eFgS

dump flash (16mb)

dump_image filename 0x50000000 0x1000000

in GDB:

target remote localhost:3333
monitor reset halt
x/100x 0xcc000000

dump:

0xcc000000:     0x10000000      0x84030000      0x00000000      0x00000000
0xcc000010:     0x00000000      0x00000000      0x00000000      0x00000000
0xcc000020:     0x00000000      0x00000000      0x00000000      0x00000000
0xcc000030:     0x00000000      0x00000000      0x00000000      0x00000000
0xcc000040:     0x10000000      0x84030000      0x00000000      0x00000000
0xcc000050:     0x00000000      0x00000000      0x00000000      0x00000000
0xcc000060:     0x00000000      0x00000000      0x00000000      0x00000000
0xcc000070:     0x00000000      0x00000000      0x00000000      0x00000000
0xcc000080:     0x10000000      0x84030000      0x00000000      0x00000000
0xcc000090:     0x00000000      0x00000000      0x00000000      0x00000000
0xcc0000a0:     0x00000000      0x00000000      0x00000000      0x00000000
0xcc0000b0:     0x00000000      0x00000000      0x00000000      0x00000000
0xcc0000c0:     0x10000000      0x84030000      0x00000000      0x00000000
0xcc0000d0:     0x00000000      0x00000000      0x00000000      0x00000000
0xcc0000e0:     0x00000000      0x00000000      0x00000000      0x00000000
0xcc0000f0:     0x00000000      0x00000000      0x00000000      0x00000000

> scan_chain
   TapName             Enabled  IdCode     Expected   IrLen IrCap IrMask
-- ------------------- -------- ---------- ---------- ----- ----- ------
 0 ixp42x.cpu             Y     0x00000000 0x19274013     7 0x01  0x7f
                                           0x19275013
                                           0x19277013
                                           0x29274013
                                           0x29275013
                                           0x29277013

Als Bootloader wird RedBoot genutzt

PASSWORT: F5BA25AB44724fb5A6DD37554809CE34

Version:

RedBoot(tm) bootstrap and debug environment [ROM]
Red Hat certified release, version 1.92.32 - built 14:21:21, Apr 14 2006

Platform: Intel Generic Residential Gateway (XScale)
Copyright (C) 2000, 2001, 2002, Red Hat, Inc.

RAM: 0x00000000-0x08000000, 0x00022980-0x07fe1000 available
FLASH: 0x50000000 - 0x50200000, 32 blocks of 0x00010000 bytes each.

TTY-DUMP dump

• Customize RedBoot http://www.intel.com/content/dam/www/public/us/en/documents/application-notes/ixp42x-ixc1100-customizing-redboot-app-note.pdf
• RedBoot User's Guide http://ecos.sourceware.org/ecos/docs-latest/redboot/redboot-guide.html

to boot OS from Redboot:

nand -t 15 -p 0xe80 -b 0x1000000 -n 0x600000
nand -t 15 -p 0xe00 -b 0x2000000 -n 0x200000
exec -b 0x2000000  -l 0x200000 -r 0x1000000 -s 0x600000  -c "console=ttyS1,115200 root=/dev/ram0 init=/bin/sh "

• 0x1000000: rootfs
• 0x2000000: kernel

Idee: https://spacegit.unibe.ch/bela/mb-linux-msli/blame/c4b78ebe0171ae81179058624229606565830bce/uClinux-dist/Documentation/INTEL-IXDP425-HOWTO

Grundsätzlich wird die Intel IXDP425 Development Platform vom Linux-Kernel unterstützt. Der erste Ansatz ist es also, einen Standard-Kernel zu bauen:

In Debian-8 muss man zunächst ein weiteres repository in die /etc/apt/sources.list eintragen:

deb http://emdebian.org/tools/debian/ jessie main

Als root:

curl http://emdebian.org/tools/debian/emdebian-toolchain-archive.key | sudo apt-key add -
sudo dpkg --add-architecture armel
sudo apt-get update
apt-get install crossbuild-essential-armel gcc-arm-linux-gnueabi

Jetzt sollten wir alles haben, um

git clone --depth 10 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
cd linux
export CROSS_COMPILE=arm-linux-gnueabi-
export ARCH=arm
make ixp4xx_defconfig
make -j5

Ob der Kernel dann wirklich funktioniert wird ein Test zeigen…

Interessant: https://www.kernel.org/doc/Documentation/arm/SA1100/Assabet