Hello, all--
Disclaimer: this is my first time posting.
I'm trying to use a Zedboard to create a modified version of XAPP1079 (V1.0.1), that will let me write to the SD card using proc1 (the second processor). I have simplified the provided code for my needs and I have the two processors working together. I'm using the xilffs_v4_1 FAT32 library to handle writes to the SD card. I'm able to write to the SD card from proc1 when it's running by itself, but not when both processors are running together after booting from QSPI. However, I am able to write to the SD card using proc0 (the first processor) when both processors are running. I am receiving this error when proc1 attempts to open/create a file for writing: (from "ff.h") FR_NOT_READY, /* (3) The physical drive cannot work */. To reiterate, this error does not occur when I swap the SD card code over to proc0.
I figure that the FSBL it interfering with SD card access from the second processor somehow. I modified the generated FSBL main function (the first time I've done this) by removing the SD boot section around line 450, but my problem persists. The FSBL is being run from proc0.
Here's my source code. The #define SD in each file is mutually exclusive, and I've used it to verify that SD card access is available to proc0 and not proc1, with all other variables left unchanged.
proc0 main:
#include "sleep.h"
#include "xil_io.h"
#include "xil_mmu.h"
#include "xil_printf.h"
#include "xpseudo_asm.h"
//#define SD
#ifdef SD
#include "ff.h"
#endif
#define sev() __asm__("sev")
#define CPU1STARTADR 0xfffffff0
#define COMM_VAL (*(volatile unsigned long *)(0xFFFF0000))
int main() {
#ifdef SD
bool ok = true;
bool sd_done = false;
FATFS fatfs;
FIL file;
char filename[32] = "test.dat";
TCHAR* Path = (TCHAR*) "0:/";
FRESULT fstatus = FR_OK;
#endif
//rbuff_S_ptr = (rbuff_struct*) CPU0_DDR_BUFFER;
//Disable cache on OCM
Xil_SetTlbAttributes(0xFFFF0000, 0x14de2); // S=b1 TEX=b100 AP=b11, Domain=b1111, C=b0, B=b0
COMM_VAL = 0;
sleep(5);
xil_printf("CPU0: writing startaddress for cpu1\n\r");
Xil_Out32(CPU1STARTADR, 0x00200000);
dmb(); //waits until write has finished
xil_printf("CPU0: sending the SEV to wake up CPU1\n\r");
sev();
sleep(1);
while (1) {
COMM_VAL = 1;
while (COMM_VAL == 1)
;
xil_printf("CPU0: Hello World CPU 0\n\r");
#ifdef SD
if (!sd_done) {
xil_printf("CPU0: Preparing SD ");
try {
// SD Card
fstatus = f_mount(&fatfs, Path, 0);
if (fstatus != FR_OK) throw 1;
// Creates a file on the SD card.
fstatus = f_open(&file, filename, FA_OPEN_APPEND | FA_WRITE);
if (fstatus != FR_OK) throw 2;
// Moves file pointer to the start of the file.
fstatus = f_lseek(&file, 0);
if (fstatus != FR_OK) throw 3;
fstatus = f_write(&file, (const void*) filename, sizeof(filename),
nullptr);
fstatus = f_sync(&file);
xil_printf("DONE\r\n");
} catch (const int& e) {
ok = false;
xil_printf("ERROR %d\r\n", e);
xil_printf("fstatus (hex) %x\r\n", fstatus);
}
if (ok) sd_done = true;
}
#endif
}
return 0;
}proc1 main:
#include "sleep.h"
#include "xil_cache.h"
#include "xil_io.h"
#include "xil_mmu.h"
#include "xil_printf.h"
#define SD
#ifdef SD
#include "ff.h"
#endif
#define COMM_VAL (*(volatile unsigned long *)(0xFFFF0000))
int main() {
#ifdef SD
bool ok = true;
bool sd_done = false;
FATFS fatfs;
FIL file;
char filename[32] = "test.dat";
TCHAR* Path = (TCHAR*) "0:/";
FRESULT fstatus = FR_OK;
#endif
//Disable cache on OCM
Xil_SetTlbAttributes(0xFFFF0000, 0x14de2); // S=b1 TEX=b100 AP=b11, Domain=b1111, C=b0, B=b0
while (1) {
while (COMM_VAL == 0) {
};
if (ok) xil_printf("CPU1: Hello World CPU 1\r\n");
else xil_printf("CPU1: INIT FAILED\r\n");
#ifdef SD
if (!sd_done) {
xil_printf("CPU1: Preparing SD ");
try {
// SD Card
fstatus = f_mount(&fatfs, Path, 0);
if (fstatus != FR_OK) throw 1;
// Creates a file on the SD card.
fstatus = f_open(&file, filename, FA_OPEN_APPEND | FA_WRITE);
if (fstatus != FR_OK) throw 2;
// Moves file pointer to the start of the file.
fstatus = f_lseek(&file, 0);
if (fstatus != FR_OK) throw 3;
fstatus = f_write(&file, (const void*) filename, sizeof(filename),
nullptr);
fstatus = f_sync(&file);
xil_printf("DONE\r\n");
} catch (const int& e) {
ok = false;
xil_printf("ERROR %d\r\n", e);
xil_printf("fstatus (hex) %x\r\n", fstatus);
}
if (ok) sd_done = true;
}
#endif
sleep(2); //Delay so output can be seen
COMM_VAL = 0;
}
return 0;
}
Terminal output:
CPU0: writing startaddress for cpu1
CPU0: sending the SEV to wake up CPU1
CPU1: Hello World CPU 1
CPU1: Preparing SD ERROR 2
fstatus (hex) 3
CPU0: Hello World CPU 0
CPU1: INIT FAILED
...
