int main()
{
char *buf = (char*) 0x200000;
if (initSdmmcDevice() < 0)
{
printf("error initializing card\n");
return -1;
}
// Read blocks in reverse order to verify address is set correctly.
for (int i = TRANSFER_LENGTH - 1; i >= 0; i--)
readSdmmcDevice(i, buf + i * BLOCK_SIZE);
return 0;
}
static int initFileSystem()
{
char superBlock[BLOCK_SIZE];
int numDirectoryBlocks;
int blockNum;
FsHeader *header;
// SDMMC not supported on FPGA currently. Fall back to ramdisk if it fails.
if (initSdmmcDevice() < 0)
{
printf("SDMMC init failed, using ramdisk\n");
gUseRamdisk = 1;
}
// Read directory
if (readBlock(0, superBlock) <= 0)
{
errno = EIO;
return -1;
}
header = (FsHeader*) superBlock;
if (memcmp(header->magic, FS_MAGIC, 4) != 0)
{
printf("Bad filesystem: invalid magic value\n");
errno = EIO;
return -1;
}
numDirectoryBlocks = ((header->numDirectoryEntries - 1) * sizeof(DirectoryEntry)
+ sizeof(FsHeader) + BLOCK_SIZE - 1) / BLOCK_SIZE;
gDirectory = (FsHeader*) malloc(numDirectoryBlocks * BLOCK_SIZE);
memcpy(gDirectory, superBlock, BLOCK_SIZE);
for (blockNum = 1; blockNum < numDirectoryBlocks; blockNum++)
{
if (readBlock(blockNum, ((char*)gDirectory) + BLOCK_SIZE * blockNum) <= 0)
{
errno = EIO;
return -1;
}
}
return 0;
}
