Looking to make a driver from already available driver list

[elekgal-bit]

I replaced pinout from skr_pro_v1_1_map.h with pinout for FLY Mellow8 . Added pin definitions M6 , M7 under M5 (skr pro 1.1 is 6 axis ).
Didn't tryed to compile .
Q: Will this work ? Or , i have to make more changes ?
Compiled grbl for Mega boards , but never for STM32

[terjeio]

It will work if the board uses the same F4 variant and crystal frequency. If not you will have to change the build configuration. You may also have to add a new clock tree setup if the variant is not currently supported. Do you have a link to the board?

[elekgal-bit]

https://github.com/Mellow-3D/Fly-Super8 (I have this)

[terjeio]

Ok, same procesor variant as the SKR, if the crystal is 8 MHz it should work. You will flash via the SD card (bootloader)?

[elekgal-bit]

I know of 3 variants :
Super8 : 32-bit ARM Cortex-M4 series 168 MHz, STM32F407ZGT6 chip , 1Mb flash

Super8 PRO : 32-bit ARM Cortex-M7 Kernel 550MHz, STM32H723ZGT6 Chip.
https://mellow-3d.github.io/fly_super8_pro_h723_general.html

I saw with STM32H743ZIT6 cip to.

[elekgal-bit]

https://mellow.klipper.cn/en/docs/ProductDoc/MainBoard/fly-super/fly-super8/flash/

…

On Sun, Aug 31, 2025 at 10:58 AM Terje Io ***@***.***> wrote: *terjeio* left a comment (grblHAL/STM32F4xx#252) <#252 (comment)> Ok, same procesor variant as the SKR, if the crystal is 8 MHz it should work. You will flash via the SD card (bootloader)? — Reply to this email directly, view it on GitHub <#252 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BWWZEAY2QR3IO7CWBEDSYG33QKTLBAVCNFSM6AAAAACFGXAYWCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTEMZZHA4DINZVGM> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[elekgal-bit]

https://mellow.klipper.cn/en/docs/ProductDoc/MainBoard/fly-super/fly-super8/flash/

[terjeio]

Well, then you should just try with compiling a SKR bootloader version with the new map. If the crystal and the bootloaders are the same it could be that it just works.

[elekgal-bit]

 Suspended project for now . Just received the BTT Octopus Pro 1.1 with : STM32H723ZET chip , 512k flash , 550MHz .

Generated firmware.bin with https://svn.io-engineering.com:8443/

Inserted jumper on board :

conected to pc via USB C

Followed this tutorial https://www.youtube.com/watch?v=VlCYI2U-qyM , from minute 3:20

Disconnect from soft . Disconnect USB C . Remove jumper from BOOT pin. Reconnect to PC .
I'm using it with grblGRU . Works ! Have to remove alarms and properly config setups .

Cheers !