Update fpv-sigmastar.md (#257)

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@ -12,36 +12,39 @@ Instructions for installing OpenIPC firmware on SigmaStar devices
### SSC338Q + IMX415 + NAND flash, board from CamHi vendor
#### Quick note on experiments, will be revised and updated
* [The files for this experiment are temporarily available here](https://github.com/OpenIPC/sandbox-fpv/tree/master/sigmastar)
#### Explanations
#### Summary
The Sigmastar IPL (pre-bootloader) allows to boot a custom U-Boot from the sdcard.
The provided UBOOT + uImage.ssc338q is a fully working openipc firmware, that you can connect to via SSH / WEB over the ethernet connection.
With this temporary openipc firmware you can create a backup of the internal NAND and flash the permanent openipc firmware to the NAND.
With this temporary OpenIPC firmware you can create a backup of the nand and flash the permanent firmware afterwards.
#### Prepare
Here is the sdcard firmware to install openipc to the nand flash.
- Connect your SD card to your computer, create a 1 GB partition on it, format it as FAT32 / VFAT.
- In Linux you just need to use the commands fdisk and mkfs.vfat
- Mount disk and unpack ssc338q_initramfs.zip and copy both files to the root directory.
- The UBOOT and uImage.ssc338q is used for the temporary sdcard system and to gain access to the NAND flash.
- Reboot the device and let it start from the SD card
- $\color{red}{\texttt{Do not stop the bootloader under any circumstances!}}$
- Connect your sdcard to your computer, create a 1 GB partition and format it as FAT32 / VFAT.
- [Download and unpack ssc338q-initramfs.zip][1]
- Copy all files to the root directory of the sdcard, update your wireless credentials on autoconfig.sh:
```diff
#!/bin/sh
+WLAN_SSID="Router"
+WLAN_PASS="12345678"
```
- Put the sdcard into the camera module, start it and wait until it connects to your router.
- Use ssh to connect to the camera:
```
ssh root@192.168.1.100
root
12345
```
#### Backup
- The /dev/mtd0 uses the complete partition size of the nand flash, so this can also be used for a backup.
- But this might take some time, the backup to the sdcard is very slow.
- /dev/mtd0 uses the complete partition size of the nand flash.
- This might take some time, the backup to the sdcard is rather slow.
```
nanddump -f /mnt/mmcblk0p1/backup-nand.bin /dev/mtd0
```
#### Install
The ssc338q-nand.bin includes the current distributor bootloader and nand ultimate firmware.
```
flash_eraseall /dev/mtd0
nandwrite /dev/mtd0 /mnt/mmcblk0p1/ssc338q-nand.bin
nandwrite /dev/mtd0 /mnt/mmcblk0p1/ssc338q-fpv.bin
```
#### Buying a device (CamHi vendor)
@ -61,3 +64,5 @@ Information collection continues
### Other notes
For testing please use the [MPV](https://mpv.io/) player, in which the Shift+I key combination can be used to get debugging information.
[1]: https://github.com/OpenIPC/wiki/files/13379877/ssc338q-initramfs.zip