Over the past decade I've purchased several Chinese cheapo keypad phones, and they all seem to run a very similar java-based OS. Does anyone have any information on what OS that is exactly, and if it's open source?
There are also phones on Mocor5 OS, a little more expensive, it's actually Android 4.4 on the Spreadtrum SC7715 chipset.
I didn't find any Java here, but these CPUs have a Jazelle ARM extension to run Java bytecode.
P.S.: There's an old project based on reverse engineered MT6260 firmware: https://github.com/xobs/fernly
I load the code not while the OS is running, but through boot via USB.
SC6531DA is similar to SC6531E, but some constants have been changed, so additional research into its firmware is required.
I have enough knowledge to run some game on the SC6531E, but a lot of work still needs to be done.
Anyone want to cooperate with me?
It's not open source per se, but the phones themselves tend to have very little modification from the reference EVK, which means if you can find the BSP you can usually build a firmware image that will work on a device.
So writing firmware that will work on most phones on a particular chipset will not be so easy.
> MAUI, a feature-phone operating system used with MediaTek-based shanzhai devices, also used on Motorola phones and some Samsung feature phones.
> MediaTek developed an embedded operating system named MAUI Runtime Environment which is based on Nucleus RTOS.
So it's not raw Nucleus.