|Ver.||S/N||OpenWrt Version Supported||Model Specific Notes|
|v1||S30852-H70x-xxxx||no||original firmware version 2.x.x.x|
|v1||S30852-S70x-xxxx||no||original firmware version 2.x.x.x, see: https://forum.openwrt.org/viewtopic.php?id=36612|
|v2||S30852-S70x-xxxx||trunk, backfire with patch||original firmware version 4.x.x.x|
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
|Lantiq Xway Danube @333Mhz Dual Core (second core is for voip dsp)||32MB||8MB||4 RJ45 ports||Yes||Yes||Yes|
Please check out the article Flash Layout. It contains an example and a couple of explanations.
|Default Flash Layout|
|mtd2||0x00010000||0x00700000||7104KB||secondary loader + runtime|
|Modified Flash Layout|
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.
|The secondary_boot.img in the link above has broken networking. After flashing it uploading through the HTTP server won't work. You have to use the serial interface and UART method afterwards as described below.|
|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|
| For the second method you must have a serial TTL interface installed! You need also a TFTP server and new built
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
(Thanks to snk for supporting and make it work)
Since the bootloader for AA is broken and there are not yet any BB-ready images, this will give you a temporary installation for BB. All BB images needed for installation can be found here.
This procedure uses a tftp server on your system. See the Wiki for detailed information. Set the computers IP address to 192.168.1.2. This is the serverip from which the router loads the images.
Follow the next steps for installation
tftp sx762_fw.bin protect off 0xb07f0000 +$filesize erase 0xb07f0000 +$filesize cp.b $fileaddr 0xb07f0000 $filesize protect on 0xb07f0000 +$filesize
tftp sx762.img protect off $kernel_addr +$filesize erase $kernel_addr +$filesize cp.b $fileaddr $kernel_addr $filesize
|System-On-Chip: Lantiq PSB 50702 E v1.3 or (v1.4) (MIPS 24Kc)|
|CPU/Speed 333 Mhz (second core is for voip dsp)|
|Flash size: 8 MiB|
|RAM: 32 MiB|
| RAM Chip:
SX763: Atheros AR2414A b/g/super g
SX762: Atheros AR2413 b/g
|Ethernet: Infineon ADM6996i|
|Internet: ADSL2+ (annex A and B)|
|USB: Yes 1 x 2.0|
|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|
(More images @ Gigaset)
Note: This will void your warranty!
To get to the board you need:
If your serial cable requires a Vcc, you can use the lower-right pad (i.e. not the one just below the two GND pads, but the one below that).
Serial port is at 3.3V and the bitrate is 115200.
Serial output from default bootloader:
Bootstrap pin funcion table:
Value 1 = 3.3v is connected to that pin
Value 0 = Pin is connected to digital GND
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.
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