sd card total size and used size

[MungoBerry]

Hi,

I'm using a teensy 3.5 with Arduino 1.8.19 and teensyduino 1.57.

The following code works under 1.56 but returns 0 with 1.57:

#include <SD.h>

void setup()
{
	Serial.begin(9600);
	
	if ( ! SD.sdfs.begin(SdioConfig(DMA_SDIO)) )
		Serial.println("unable to init SD!");
	else
	{
		uint32_t sizeInKb = (uint32_t)((SD.totalSize() - SD.usedSize()) / 1000);
		Serial.printf("SD available space is %" PRIu32 "Kb\n", sizeInKb);
	}
}

void loop()
{
	yield();
}

SD.totalSize and SD.usedSize both returns 0.
There are some small changes in SD.h and SD.cpp between versions but I was unable to fix it!

Finally, may I ask:

• why I need to specify "Serial.begin(9600);" with 1.57 to see output ? Version 1.56 do not need it.
• is teensyduino version specified as define somewhere ? I would to put it inside my program.

Thank you.