Windows 10 IoT is being ported to Prime G2 by imbushuo

→ **MyCalcs** profile · by **imbushuo** » 07 Nov 2019, 20:43

Upstreaming U-Boot is pretty much possible. Currently U-Boot status:

1. Functional screen output requires a patch in drivers/video/msxfb.c since the current U-Boot code doesn't not support 24/32b Serial RGB output mode.

2. No keypad driver: have to implement one for on-device console.

3. USB, I2C, PMIC, GPIO (LEDs) and NAND are functional.

→ **MyCalcs** profile · by **Lionel Debroux** » 07 Nov 2019, 21:48

Indeed, contacting upstream about those changes would be a good first step

→ **MyCalcs** profile · by **Adriweb** » 08 Nov 2019, 02:09

Nice job, and good luck with upstreaming (as much as possible

)

→ **MyCalcs** profile · by **imbushuo** » 20 Nov 2019, 22:25

https://twitter.com/imbushuo/status/1197040920077594625

As of today the UEFI is capable to bring up Windows 10 IoT into system shell. WinDbg is also available over UART connection.

→ **MyCalcs** profile · by **Lionel Debroux** » 20 Nov 2019, 22:28

Very good work

Minutes of boot time isn't exactly fun, but according to your tweet, the CPU isn't running at full clock speed, is it ? 396 MHz is just about the CPU frequency of the Prime G1 or the Nspire CX II series.

→ **MyCalcs** profile · by **critor** » 20 Nov 2019, 22:34

Oh great !

→ **MyCalcs** profile · by **imbushuo** » 21 Nov 2019, 01:20

Lionel Debroux wrote:Very good work
Minutes of boot time isn't exactly fun, but according to your tweet, the CPU isn't running at full clock speed, is it ? 396 MHz is just about the CPU frequency of the Prime G1 or the Nspire CX II series.

Yes 396MHz isn't the full speed, dynamic frequency scaling in system is not yet implemented.

→ **MyCalcs** profile · by **critor** » 25 Nov 2019, 18:30

Thank you very much, it made the front page today :

viewtopic.php?f=55&t=23173&p=248522#p248519

→ **MyCalcs** profile · by **newbie06** » 26 Nov 2019, 13:02

Impressive result, congratulations

I have what might be a silly question, but I'll ask anyway. My understanding is that you can't upload a modified firmware to the G2 as there's some kind of checksum. If the checksum happens on calculator side, this might be done by the existing bootloader or some other piece of low-level software that doesn't get replaced when flashing an update. Could this code be dumped? Or is it protected behind TrustZone? This could help reverse engineer the checksum protocol and/or build an emulator.

Thanks