implemented vdp and mos-switch

[S0urceror]

Hi,

I added a couple of functions to be able to switch ESP32 firmwares and EZ80 kernels.

The ESP32 part relies on something that is already existing in VDP1.04 and I added in ElectronHAL. If you flash an image you can go back to the previous one and vice-versa. The ESP32 has memory enough for two firmwares.

The EZ80 part relies on the fact that you have one kernel sitting in ROM at 0x000000 - 0x00ffff and another one in 0x010000 - 0x01ffff. I created a combined MOS-ElectronOS image and flashed it with your existing code without problems. Then the mos-switch function takes care of the rest. As long as the 2nd kernel is compiled with a specific memory layout in mind. You'll find some details in the switch-memory-design.txt.

Maybe we can work together to have this officially supported in your tool. Let me know what you think.

[envenomator]

Sorry it took me a while to respond. I think it's an interesting option to switch, but I'd rather see a separate switch command instead of providing this as an option.

[S0urceror]

You mean a separate switching application in stead of integrating it in your tool? That makes sense. In my daily use I switch a lot but I don't often reflash. I'll whip up something separate soon. Let's call it agon-switch.