v1 is based on amazon SoC, so we won't talk about that version here.

Beware when buying a SX762 second hand, it might have the correct serial number, but the wrong firmware, see link above

• ADSL modem is working with both Annex A & Annex B supported.
• WiFi is working out of the box with trunk. (ath5k)
• FXS works and can be used with owsip daemon.
• USB works with a ugly patch.
• FXO port is not working.

1. → obtain.firmware
2. → Install OpenWrt (generic explanation)

Please check out the article Flash Layout. It contains an example and a couple of explanations.

The original firmware contains two modified uboot bootloaders. Only the secondary one has a CLI.

• The primary bootloader checks the header checksum (sha256) of the secondary bootloader
• The secondary bootloader does the same thing with the firmware.
• The sha256bit header checksum is generated by a 1024bit RSA private key which is currently unavailable.

Since the checking is only done for first 64Bytes of every 64k block it is possible to edit the secondary bootloader because it's size is less than 64k, by replacing lzma part and replacing it with lzma compressed u-boot. You have two options to install OpenWrt:

If for any reason OpenWrt fails to boot, a recovery HTTP server can be started by keeping the reset button underneath pressed, while powering the router on. Note that original fw .img can't be uploaded via recovery HTTP server.

1. download a modified secondary bootloader here
2. The modified secondary u-boot bootloader can be flashed from original web interface firmware upgrade section
3. after replacing the original secondary bootloader over the original WebInterface with the version provided in the link, you need to reboot the device.
4. since there is no OpenWrt in flash yet, after a reboot it will open HTTP server on 192.168.1.1 asking for OpenWrt image.

This is used to flash u-boot as a primary bootloader. There are two methods to flash u-boot as a primary bootloader, first one from a runing openwrt image, and a second one from serial console

1. before replacing the bootloader, make sure that you flashed secondary bootloader as noted above and that you are running openwrt fw from here
2. obtain the replacement booloader by selecting it the buildmenu (configuration), or downlaod from snapshot
3. if you compiled u-boot you will find the file u-boot-bootstrap.bin in ../trunk/bin/uboot-lantiq-gigaSX76X_DDRsamsung166/ after compilation.
4. copy u-boot-bootstrap.bin to /tmp folder inside router filesystem.
5. flash env to uboot_env partition with "dd if=/dev/mtdblock3 of=/dev/mtdblock4"
6. flash u-boot-bootstrap.bin with "mtd write /tmp/u-boot-bootstrap.bin uboot"
7. now reboot, run recovery HTTP server, and flash image from trunk

For the second method you must have a serial TTL interface installed! You need also a TFTP server and new built u-boot-bootstrap.bin in its root folder.

1. U-boot CLI commands:

   setenv ipaddr 192.168.1.1
   setenv serverip 192.168.1.254
   
   //unprotect sectors
   protect off 1:0-20
   
   //first copy nvram to new address:
   era 0xb0010000 0xb001ffff
   cp.b 0xb000e000 0xb0010000 0x2000
   
   tftpboot 0x816e0000 u-boot-bootstrap.bin
   era 0xb0000000 0xb000ffff
   cp.b 0x816e0000 0xb0000000 0x10000
   reset
   

2. since there is no OpenWrt in flash yet, first time after reboot the bootloader will open HTTP server on 192.168.0.119 asking for OpenWrt image.

CPU info:

system type             : DANUBE
processor               : 0
cpu model               : MIPS 4KEc V4.1
BogoMIPS                : 222.00
wait instruction        : yes
microsecond timers      : yes
tlb_entries             : 16
extra interrupt vector  : yes
hardware watchpoint     : yes
VCED exceptions         : not available
VCEI exceptions         : not available

PCB:

(More images @ Gigaset)

Note: This will void your warranty!

To get to the board you need:

• unscrew 4 torx-10 screws underneath the cover,
• pull the upper cover which is connected by click.

→ port.serial.

Pinout:

Serial port is at 3.3V and the bitrate is 115200.

Serial output from default bootloader: ROM VER: 1.0.3 CFG 01 Read EEPROMX X SHC Danube-External-Flash-Boot - Version V1.2 Mem-config: Flash: 8MB- 8MBx1 Ram: 32MB-32MBx1 Low level dbg is active... CPU0 MEMS ROM VER: 1.0.3 CFG 01 Read EEPROMX X SHC Danube-External-Flash-Boot - Version V1.2 Mem-config: Flash: 8MB- 8MBx1 Ram: 32MB-32MBx1 Low level dbg is active... CPU0 MEMS -- Danube Primary loader -- Version : 4.1.24.52.12 Build Profile : sx76x_danube_a Build Date : Jun 10 2009 - 17:11:31 --> Extract primary loader [ OK ] --> Validate secondary loader (FLASH) [ OK ] -- Danube Secondary loader -- Version : 4.1.28.52.12 Build Profile : sx76x_danube_b Build Date : Dec 15 2009 - 17:54:55 --> Extract secondary loader [ OK ] --> Press enter to activate cli [ 00 ] sx76x > help base - print or set address offset bootm - boot application image from memory bootp - boot image via network using BootP/TFTP protocol bootd - boot default, i.e., run 'bootcmd' cmp - memory compare cp - memory copy crc32 - checksum calculation erase - erase FLASH memory flinfo - print FLASH memory information go - start application at address 'addr' help - print online help loop - infinite loop on address range md - memory display mm - memory modify (auto-incrementing) mtest - simple RAM test mw - memory write (fill) nm - memory modify (constant address) printenv- print environment variables protect - enable or disable FLASH write protection rarpboot- boot image via network using RARP/TFTP protocol reset - Perform RESET of the CPU run - run commands in an environment variable saveenv - save environment variables to persistent storage setenv - set environment variables tftpboot- boot image via network using TFTP protocol and env variables ipaddr and serverip upgrade - data_block_name srcAddr srcLen 0/1 ? - alias for 'help' sx76x > printenv bootcmd=run flash_flash bootdelay=0 baudrate=115200 preboot=echo;echo Type "run flash_nfs" to mount root filesystem over NFS;echo hwboardid=sx76x-08-32 bootstrap=1 console_dev=ttyS1 validate_images=on keep_magic=on netdev=eth0 ramargs=setenv bootargs root=/dev/ram rw addip=setenv bootargs $(bootargs) ip=$(ipaddr):$(serverip):$(gatewayip):$(netmask):$(hostname):$(netdev):off ramdisk_addr=B0100000 flash_self=run ramargs addip addmisc;bootm $(kernel_addr) $(ramdisk_addr) bootfile=runtime.img primary_boot_file=primary_boot.img secondary_boot_file=secondary_boot.img runtime_file=runtime.img flashargs=setenv bootargs root=/dev/mtdblock1 rootfstype=squashfs flash_flash=run flashargs addmisc; bootm $(kernel_addr) update_primary=tftpboot 80400000 $(primary_boot_file);upgrade primary 80400000 $(filesize) 0 update_secondary=tftpboot 80400000 $(secondary_boot_file);upgrade secondary 80400000 $(filesize) 0 update_runtime=tftpboot 80400000 $(runtime_file);upgrade runtime 80400000 $(filesize) 0 reset_nvram=erase 0xB000E000 0xB000EBFF 1 addmisc=setenv bootargs $(bootargs) ethaddr=$(ethaddr) panic=1 tftp_RootDir=tftpboot tftp_DeviceDir=porta_danube tftp_Rootfspath=root kernelfile=uImage nfsargs=setenv bootargs root=/dev/nfs rw add_nfsrootfs=setenv bootargs $(bootargs) nfsroot=/$(tftp_RootDir)/$(tftp_DeviceDir)/$(tftp_Rootfspath) flash_nfs=run nfsargs add_nfsrootfs addip addmisc;bootm $(kernel_addr) nfs_flash=tftp 0x80400000 $(kernelfile);run flashargs addip addmisc;bootm 0x80400000 nfs_nfs=tftp 0x80400000 $(kernelfile);run nfsargs add_nfsrootfs addip addmisc;bootm 0x80400000 silent=0 rnd_num= hwid=Q706-B731 ethcnt=8 boardid=sx763 usbpower=1 platform_type=2 desc=CT013000000000xxxxxxxxx ethaddr=00:21:04:9E:xx:xx customer=0 default_variant=ethernet primary_version=v4.1.24.52.12 filesize=30180 gatewayip=192.168.2.1 ipaddr=192.168.2.1 serverip=192.168.2.16 variant=ethernet options=2 stdin=serial stdout=serial stderr=serial Environment size: 1933/3068 bytes

Bootstrap pin funcion table:

Value 1 = 3.3v is connected to that pin
Value 0 = Pin is connected to digital GND

boot_sel2, boot_sel1, boot_sel0 pins location:

Note: boot_sel2 and boot_sel1 are by default on 0 and boot_sel0 is on 1.

To enable uart mode, short pins at boot_sel2 (see picture) and connect boot_sel0 to gnd. Than you can send u-boot.asc(downlaod here) to serial port.
For example if your serial port is ttyUSB0 than do: "cat u-boot.asc > /dev/ttyUSB0" and wait until u-boot starts.

UART mode looks like this:

ROM VER: 1.0.3
CFG 04
Read EEPROMX
 X
UART

SX763 uses a DC/DC switching regulator for 5V USB power, and unfortunately the chip is disabled by OpenWRT and other unofficial firmware (as of april 2013). The chip that provides 5V for USB has enable pin (number 7 to be exact), and the original firmware pulls the enable pin from 0.3V to 3.3V about two seconds before the relay makes a click sound.

According to datasheet, enable pin can be unconnected if we want the chip to auto-start, and that is exactly what we want. Therefore, we just need to disconnect the pin number 7 and SX763 will have 5V at USB connector all the time.

Note: When sx76x support gets back to trunk, there will be usb power by default so this hack wont be needed.

A close-up:

Another close-up is available at :http://pljusak.com/papuk/RSCN1314.JPG

The good sides of this hack are: 1) if you break the pin on the chip no harm is done, and 2) there are no side-effects in possible overloading the other 5V regulator that is used if you bring the 5V from another DC/DC regulator, as in hack that follows.

Previous version of 5V-USB hack follows:

Here is example of added usb power (5.05V measured) over simple pin solder so devices can be recognized on boot. You can even use WIFI dongles as from Attitude Adjustment 12.09-RC1 it works just fine. USB Dongle tested and working: Edimax EW-7722UnD a/b/g/n - Tested in 40mhz HT mode. Max speed measured (TCP): 20mbit (dirty conditions). Over USB hub you could add few more which makes this even a very good base station.

On USB port - solder first pin from top.

More info can be found on: http://linux.jezgra.net/2013/02/sx763-hack/

Please note that side-effects of this power mod are unknown. (Probably there should be no 'ugly-usb-patch' added anymore, so it doesn't give power on already powered pin.)

There is a tarball with basic code at http://opensource.sagemcom.com/index.php?id=54