riscvp2: a C and C++ compiler for P2

Rayman

@ersmith I'll try that thanks.

On another front, I'm having problem with loadp2 and the -HIMEM=flash .elf outputs.
Seems above some size, it gives me:

ERROR: timeout waiting for checksum at end: got 1     
Try increasing the FIFO setting if not large enough for your setup              
Press enter to continue...   

On one computer, was able to fix it by adding the "-v" verbose option.
Haven't found a solution yet on another...

WAIT A SEC. Seems the binary on the working PC also works on this problem PC...
Must be a problem in the code somewhere...

Rayman

@ersmith Ok, does seem there is a problem with loadp2 and -himem=flash.
One setup did not have "#define MICROPY_PY_SELECT (1)" in it and was just a hair smaller and that works.
But, when that is added, it can no longer load.
The difference in code size is tiny:

text data bss dec
294540 16936 217640 529116 --> Won't load
292848 16904 217640 527392 --> Loads ok

Here are two elf examples. Smaller one loads, bigger one won't...

Rayman

Added an extra delay in loadp2.c and seems to have fixed it:

static int verify_chksum(unsigned chksum)
{
    unsigned recv_chksum = 0;
    int num;
    wait_drain();
    //msleep(1+fifo_size*10*1000/loader_baud);
    //num = rx_timeout((uint8_t *)buffer, 3, 400);
    msleep(50);//RJA