Arduino Zero and micro SD card not working

Question

I have an Arduino Zero processor (atsamd21g18a) with a microSD shield connected (check images of schematics)

The point is that I cant make it to work, not with sd.h sketch and not with sdfat.h sketch.

Chip-select for the SD card is A3 or digital pin 17.

sd.h sketch

#include <SPI.h>
#include <SD.h>

File myFile;

void setup() {
  // Open serial communications and wait for port to open:
  SerialUSB.begin(9600);
  delay(1000);
  
 while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }


  SerialUSB.print("Initializing SD card...");

  if (!SD.begin(A3)) {
    SerialUSB.println("initialization failed!");
    return;
  }
  SerialUSB.println("initialization done.");

  if (SD.exists("example.txt")) {
    SerialUSB.println("example.txt exists.");
  } else {
    SerialUSB.println("example.txt doesn't exist.");
  }

  // open a new file and immediately close it:
  SerialUSB.println("Creating example.txt...");
  myFile = SD.open("example.txt", FILE_WRITE);
  myFile.close();

  // Check to see if the file exists:
  if (SD.exists("example.txt")) {
    SerialUSB.println("example.txt exists.");
  } else {
    SerialUSB.println("example.txt doesn't exist.");
  }

  // delete the file:
  SerialUSB.println("Removing example.txt...");
  //SD.remove("example.txt");

  if (SD.exists("example.txt")) {
    SerialUSB.println("example.txt exists.");
  } else {
    SerialUSB.println("example.txt doesn't exist.");
  }
}

void loop() {
  // nothing happens after setup finishes.
}

sdfat.h code

const int chipSelect = A3;
/*
 SD card read/write
  
 This example shows how to read and write data to and from an SD card file   
 The circuit:
 * SD card attached to SPI bus as follows:
 ** MOSI - pin 11
 ** MISO - pin 12
 ** CLK - pin 13
 ** CS - pin 4
 
 created   Nov 2010
 by David A. Mellis
 updated 2 Dec 2010
 by Tom Igoe
 modified by Bill Greiman 11 Apr 2011
 This example code is in the public domain.
   
 */
#include <SdFat.h>
SdFat sd;
SdFile myFile;

pinMode(chipSelect, OUTPUT);

void setup() {
  delay(5000);
  SerialUSB.begin(9600);
  SerialUSB.println("Serial start");
  //while (!SerialUSB) {}  // wait for Leonardo
  //SerialUSB.println("Type any character to start");
  //while (SerialUSB.read() <= 0) {}
  delay(1000);  // catch Due reset problem
  
  // Initialize SdFat or print a detailed error message and halt
  // Use half speed like the native library.
  // change to SPI_FULL_SPEED for more performance.
  if (!sd.begin(chipSelect, SPI_HALF_SPEED)) sd.initErrorHalt();

  // open the file for write at end like the Native SD library
  if (!myFile.open("test.txt", O_RDWR | O_CREAT | O_AT_END)) {
    sd.errorHalt("opening test.txt for write failed");
  }
  // if the file opened okay, write to it:
  SerialUSB.print("Writing to test.txt...");
  myFile.println("testing 1, 2, 3.");

  // close the file:
  myFile.close();
  SerialUSB.println("done.");

  // re-open the file for reading:
  if (!myFile.open("test.txt", O_READ)) {
    sd.errorHalt("opening test.txt for read failed");
  }
  SerialUSB.println("test.txt:");

  // read from the file until there's nothing else in it:
  int data;
  while ((data = myFile.read()) >= 0) SerialUSB.write(data);
  // close the file:
  myFile.close();
}

void loop() {
  // nothing happens after setup
  SerialUSB.println("loop done.");
}

I am not sure if it is a hardware or software issue, but soldering and tracks are good.

Its like the hardware gets frozen, so I cant really see the serial messages. I know its not a serial issue because I can make a simple print serial script and it shows up. I think it might be related with libraries, or maybe some hardware limitation?

Can I use any pin as Chipselect? is digitalpin17 / A3 right?