Resources

wiki at http://dsmg600.info/
forum at http://forum.dsmg600.info/

firmware (kernel+busybox)

It will fix various problems, including, but not limited to, problems with web interface in firefox.

http://download.dsmg600.info/people/sala/fwimage-04-sala-20070128

I tried to build firmware from source, but had various problems with building gcc. Thet are mostly related to gdb, but after a few random patches it passed compilation (but is broken, because I just commented offending lines).

usbfs

I also want usbfs which generate compilation errors because of missing files in include/linux/usbdevice_fs.h

#define USBDEVFS_DISCONNECT        _IO('U', 22)
#define USBDEVFS_CONNECT           _IO('U', 23)

I copied them from current 2.6 kernel and this made it compile.

Debian installation

Based on instructions on wiki and post on forum

cd /mnt/HD_a2
export DEBOOTSTRAP_DIR=`pwd`/usr/lib/debootstrap
export PATH=$PATH:/mnt/HD_a2/bin:/mnt/HD_a2/sbin
./usr/sbin/debootstrap --arch powerpc etch /mnt/HD_a2/debian http://ftp.de.debian.org/debian
cp /etc/resolv.conf /mnt/HD_a2/debian/etc/resolv.conf
# prepare chroot jail
mount -t proc proc /mnt/HD_a2/debian/proc
cd /mnt/HD_a2/
./chroot /mnt/HD_a2/debian /bin/bash
# install additional packages
apt-get update
apt-get install locales
dpkg-reconfigure locales
passwd root
apt-get install dropbear hotplug

USB printer

Kernel module for USB printers for 2.4.21-pre4 kernel: printer.o

After installation of cupsys and foomatic all went smoothly, USB printer (Samsung ML-2510) was found and configured automatically. There are a few more details in this forum thread.

Kernel 2.4

As a try to understand this ppc board, I tried to port changes from MontaVista (D-Link used that tree) to current upstream 2.4 kernel and got to the point where SCSI controller times out when reading partition table. This means that board does init, it has serial port which works and has some idea about PCI space (which seems somewhat fishy if you ask me). linux-2.4.34.4-dsmg600.diff.gz

Few more details are available in this forum post.

Kernel 2.6

I have a creazy idea: this device should run 2.6! So, here is my work in progress...

According to patches for kurobox which is quite similar to our hardware, there isn't any changes in current upstream version execept for missing drivers. For DSM G600 that boils town to IP1000 network driver, which still isn't in mainland, but seems to be referenced on LKLM as possible inclusion.

patch against upstream 2.6.21.1 linux-2.6.21.1-dsmg600.diff.gz (adds IP1000A driver for LAN, wifi missing)

Expirince with 2.4 kernel shows that I have to do more porting to make 2.6 port usable. As a start, code for board initialization is specific for DSM-G600 as well as serial port driver. When we have those two things working we can see if loader.o could boot our kernel. I think that shouldn't be problem, because loader.o origin shows that it's possible to boot 2.6 kernel from 2.4 kernel using loader.o module.

New round based on powerpc kernels

After review of current upstream kernel (2.6.22) and state of powerpc kernel.org repository I decided to base my efforts on this branch.

For now here are few useful links:

dtc compiler: git://www.jdl.com/software/dtc.git

Compilation notes

Compile kernel and convert it to binary format for loader.o:

. env.sh
make
powerpc-linux-objcopy -O binary vmlinux
scp vmlinux disk:/tmp/

Then try out your kernel on DSM:

cd /mnt/HD_a2 && sync && insmod /mnt/HD_a2/loader.o kernel=/mnt/HD_a2/debian/tmp/vmlinux

Please note that you must use full path to kernel binary. Also note that all paths are customized for my particular device (to help with copy/paste :-)

Emulation

It's useful to have development environment for DSM on another machine, so I tried to use QEMU to do so.

patch which adds support for platforms based on MPC82xx
Installing Debian Sarge for the PowerPC under the QEMU which I updated to etch to be in sync with DSM

Board specification

Here is information that I collected while working on 2.4 port in hope that it will assist me in porting 2.6 kernel

Kernel configuration options

CONFIG_6xx
CONFIG_SANDPOINT
CONFIG_PPC_ISATIMER

CONFIG_MTD_PARTITIONS
CONFIG_MTD_CHAR
CONFIG_MTD_BLOCK

CONFIG_MTD_CFI
CONFIG_MTD_GEN_PROBE
CONFIG_MTD_CFI_AMDSTD

IRQ

sandpoint_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
{
	static char pci_irq_table[][4] =
	/*
	 *      PCI IDSEL/INTPIN->INTLINE 
	 *         A   B   C   D
	 */
	{
		{   0,  0,  0,  0 },	/* IDSEL 13 - mini-PCI */
		{   1,  -1,  2,  0 },	/* IDSEL 14 - NEC USB2.0 */
		{   3,  0,  0,  0 },	/* IDSEL 15 - ADM983 */
		{   4,  0,  0,  0 }
	};

	const long min_idsel = 13, max_idsel = 16, irqs_per_slot = 4;
	return PCI_IRQ_TABLE_LOOKUP;
}

mpc10x_bridge_init -- 0xfc000000

static u_char sandpoint_openpic_initsenses[] __initdata = {
	(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* 17, EPIC IRQ 1 - PCI1 - flash*/
	(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* 18, EPIC IRQ 2 - LAN*/
	(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* 19, EPIC IRQ 3 - Not used*/
	(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE),	/* 20, EPIC IRQ 4 - Not used*/
	1
}

sandpoint_init_IRQ(void)
	/* Map EPIC IRQs 0-3 */
	openpic_set_sources(0, 5, OpenPIC_Addr + 0x10200);
	/* Skip reserved space and map i2c and DMA Ch[01] */
	openpic_set_sources(113, 3, OpenPIC_Addr + 0x11020);
	/* Skip reserved space and map Message Unit Interrupt (I2O) */
	openpic_set_sources(118, 1, OpenPIC_Addr + 0x110C0);
	//REX: UART
	openpic_set_sources(121, 1, OpenPIC_Addr + 0x11120); //ttyS0

	openpic_set_sources(122, 1, OpenPIC_Addr + 0x11140);    //ttyS1 jackl

Serial

#define UART0_INT       121
#define UART1_INT       122

#define SANDPOINT_SERIAL_0 0xFC004500
#define SANDPOINT_SERIAL_1 0xFC004600

CPU

#define CPU_200 1
#define BASE_BAUD (100000000/16)