Arduino Giga M4 SDRAM Boot not working

Official Hardware Mega GIGA R1 WiFi
1

I have followed the steps in BootM4_from_SDRAM. The M4 will not boot from SDRAM. I have seen other posts saying they have had issues with the M4 not booting until a reset but no matter what I do, the M4 will not boot with the SDRAM bin file.

Am I missing something?

3

I used the following setup. It's basically unchanged from the example other than adding a print out of the first 64 bytes of the SDRAM. This data matches the bin file.

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  while (!Serial);

  SDRAM.begin(0);

  int err = ota_data_fs.mount(&ota_data);
  if (err) {
    Serial.println("Please run WiFiFirmwareUpdater once");
    while (1) {
      delay(10000);
    }
  }

  //Copy M4 firmware to SDRAM
  long file_size = 0;
  uint8_t * boot = (uint8_t*)CM4_BINARY_START;
  FILE* fw = fopen("/fs/fw.bin", "r");
  if (fw == NULL) {
    Serial.println("Please copy a firmware for M4 core in the PORTENTA mass storage");
    Serial.println("When done, please unmount the mass storage and reset the board");
    // MassStorage.begin();
    while (1) {
      delay(10000);
    }
  }else{
    file_size = getFileSize(fw);
    Serial.println(file_size);
  }

  fread((uint8_t*)CM4_BINARY_START, file_size, 1, fw);
  fclose(fw);

  for(int i = 0; i < 64; i++){
    if(i % 16 == 0){
      Serial.println("");
    }
    Serial.print("0x");
    if(boot[i] < 16) Serial.print("0");
    Serial.print(boot[i], HEX);
    Serial.print(" ");
  }

  Serial.println(" ");

  bootM4();
}

The M4 portion of the code is unchanged from the example. I exported the bin file by keeping the Flash Split: "2MB M7 + M4 in SDRAM" option, selecting the M4 as the target core, and then exporting compiled binary. I renamed this file to fw.bin, adding it to the flash.

When the arduino boots, I confirm that the data that is being printed to serial from the SDRAM matches the bin file.

I have also tried debugging via ST-Link but cannot figure out how to see the M4 registers, specifically the PC.

6

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