The parted program is used to create the partition: To prepare an SD card from scratch using GNU/Linux, it is advisable to zeroes the first 64 Mb of the card, to remove any existing partitioning information on it:ĭd if=/dev/zero of=/dev/sdb bs=1M count=64 The Linux kernel introduced native exFAT support with the 5.4 release, in Debian you have to install the exfat-utils and exfat-fuse packages. For cards with size of 32 Gb or more, the exFAT should be the default filesystem provided by the manufacturer. The recommended filesystem for the partition should be exFAT, which is optimized for SD cards and it can host files with size grather than 4 Gb. The SJ8 Pro cannot create the required partition onto the SD card: you have to provide an already partitioned one. SD Card partitioning and formatting with GNU/Linux You can also refer to the program I wrote which can extract files and partitions from the firmware files: ambarella-h22-firmware-tools. You can refer to the page How to customize the Ambarella firmware of the SJCAM SJ8 Pro with my notes about customizing the SJ8 Pro firmware using BitrateEditor. The program has the capability to re-pack the firmware image after the edits, updating the checksums so that the file will be flashable into the camera. The program contains several configuration files, so it can check that you are actually editing the proper version of the firmware (it can do check of particular strings at particular offset, calculate regions checksums, etc.). The best approach is to use the BitrateEditor, a graphical Java program which facilitates the task of editing various parameters in form of easy readable tables. SJCAM does not facilitate the task, because it distribute different versions of the firmares marked with the same version number. Generally there is no access to the source code, so patching the firmware binary is a rather delicate task, requiring to know the exact offset of the data into that specific version of the firmware, the structure and the lenght of the data and eventually how to update the embedded checksums. You can find it here: SJCAM SJ8 Pro Custom Firmware.
I created a custom firmware to improve some video codec settings and to improve image quality (mainly color balance and saturation). In general they distribute the original firmware patched in several places, mainly to customize framerates, exposure parameters, etc. There are many hackers who produce modified versions of the original firmware.
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