forked from Imagelibrary/rtems
42ad53f395
## Implement a new ST Nucleo STM32H755ZI BSP Hi all, for a project I recently acquired a Nucleo STM32H755ZI. Thanks to the work of @sebhub, @c-mauderer, and Karel Gardas, it was pretty easy to create a new Nucleo BSP for this chip by copying the Nucleo H743 BSP. I was not able to get the 8 MHz HSE clock enabled, so this is currently clocked off of the PLL using the 64 MHz HSI clock and the RTC clock is disabled. Other features haven't been thoroughly tested, but since they rely on the high quality STM32H7 HAL from ST, I have pretty high confidence in them. I've been able to run most testsuites. I have tested: * The CM7 core * The CM4 core * Console output on UART3 (the default USB UART) and the shell * GPIO * Sample programs like `hello`, `fileio` (and shell), `paranoia`, `unlimited`, etc. Known Broken: * Debugging with OpenOCD is wonky. I can set breakpoints, halt the processor and inspect memory and registers and return from functions, but stepping does not work. * The program begins to run after being flashed but soon (under 1 second) stops running. Pressing the reset button makes the program run continuously afterward. The board resets nearly instantly. * Shell commands `ls`, `cd`, `cpuuse`, etc. hang for a while before executing. I'm not sure where the time is spent because the built-in `time` command reports that these commands execute nearly instantly. I haven't tested: * Pretty much everything else <!-- Default settings, if it is a dropdown it will set after submission -->