Dobrica Pavlinušić's random unstructured stuff
DSM-G600: Revision 34
Collection of some hints about Debian installation on my D-Link DSM-G600:

{toc: }

^ 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`

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

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

^ Debian installation

Based on "instructions on wiki"<http://dsmg600.info/howto:chroot_debian> and "post on forum"<http://forum.dsmg600.info/t17-Debian-howto.html>

.pre
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
.pre

^ USB printer

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

After installation of `cupsys` and `foomatic` all went smoothly, USB printer ("Samsung ML-2510"<http://openprinting.org/show_printer.cgi?recnum=Samsung-ML-2510>) was found and configured automatically. There are a few more details in "this forum thread"<http://forum.dsmg600.info/t105-Printing.html>.

^ 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). {file: linux-2.4.34.4-dsmg600.diff.gz}

Few more details are available in "this forum post"<http://forum.dsmg600.info/p3067-Today-182143.html#p3067>.

^ 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"<http://genbako.vodapone.com/> 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"<http://www.icplus.com.tw/driver-pp-IP1000A.html> 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 {file: 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"<http://git.kernel.org/?p=linux/kernel/git/galak/powerpc.git;a=summary> 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
* "Kurobox support in stock 2.6 kernels"<http://www.kurobox.com/mwiki/index.php/Kurobox_support_in_stock_2.6_kernels>

^^ Compilation notes

Compile kernel and convert it to binary format for "loader.o"<http://download.dsmg600.info/people/sala/loader.o>:

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

Then try out your kernel on DSM:

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

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"<http://fabrice.bellard.free.fr/qemu/> to do so.

* patch which adds support for "platforms based on MPC82xx"<http://qemu-forum.ipi.fi/viewtopic.php?t=1528>
* "Installing Debian Sarge for the PowerPC under the QEMU"<http://overselfresearch.com/kb/qemu.html> 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

^^ Memory map

Part of information extracted from u-boot loader, part from kernel source

| from | to | size | |
| 0x00000000 | 0x20000000 | 0x20000000 | SDRAM 32Mb |
| 0xFC000000 | | | EUMB |
| 0xFFC00000 | 0xFFFFFFFF | 0x00400000 | Flash 4Mb |

Important addresses:

| address | name |
| 0xC3029F00 | PCI 1033:00e0 00:0e.2 irq 2 ciehci_hcd |
| 0xC3032000 | PCI 1033:0035 00:0e.0 irq 1 usb-ohci |
| 0xC3034000 | PCI 1033:0035 00:0e.1 irq -1 usb-ohci disabled |
| 0xC30AB000 | /sys/cra0 irq 0 - virtual address |
| 0xBFFFE000 | /sys/cra0 irq 0 |
| 0xFC040000 | OpenPIC_Addr (mpc10x) |
| 0xFC004500 | ttyS0 |
| 0xFC004600 | ttyS1 |
| 0xFF800000 | ROM_CS0_START |
| 0xFF000000 | ROM_CS1_START |
| 0xFFF00000 | TEXT_BASE (u-boot) |
| 0xFFF00100 | CFG_RESET_ADDRESS |
| 0xFFF10000 | boot image load address |
| 0xFFC20000 | ramdisk load address |

Important constants:

| CFG_NS16550_CLK | 100000000 |
| CONFIG_SYS_CLK_FREQ | 100000000 |

^^ MTD

.pre
0x00000000-0x00010000 : "Linux mtd1"
0x00010000-0x00020000 : "Linux mtd2"
0x00020000-0x00300000 : "Linux Ramdisk"
0x00300000-0x00310000 : "U-BOOT BOOT LOADER"
0x00310000-0x00400000 : "Linux Kernel"
.pre

^^ Kernel configuration options

From old 2.4 kernel, just something to keep eye on while configuring 2.6 kernels...

* 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

.pre
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;
}
.pre

.pre
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
}
.pre

.pre
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
.pre

^^ mpc10x

.pre
mpc10x_bridge_init(hose,
MPC10X_MEM_MAP_B,
MPC10X_MEM_MAP_B, MPC10X_MAPB_EUMB_BASE)
.pre

should be changed to:

.pre
mpc10x_bridge_init(hose,
MPC10X_MEM_MAP_B,
MPC10X_MEM_MAP_B,
0xfc000000) == 0)
.pre

^^ IO block

consistent with following:

.pre
- io_block_mapping(0xfe000000, 0xfe000000, 0x02000000, _PAGE_IO);
+ io_block_mapping(0xfc000000, 0xfc000000, 0x04000000, _PAGE_IO);
.pre

^^ Serial

.pre
#define UART0_INT 121
#define UART1_INT 122

#define SANDPOINT_SERIAL_0 0xFC004500
#define SANDPOINT_SERIAL_1 0xFC004600
.pre

^^ CPU

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