Format flash chip with FAT
LINDOW, Phil
phil.lindow at airbus.com
Tue May 29 16:18:52 UTC 2018
Hello all,
I want to format a flash chip (S29GL01GP) with a FAT filesystem. I've tried the following approach:
1. I've implemented IO functions for my chip
int flash_init(void* start_addr, flash_device_t* handle);
int flash_erase_block(flash_device_t* handle, void* blk_addr);
int flash_program(flash_device_t* handle, void* dst, void* data, unsigned long size);
(These functions are tested and they work...)
I must use these functions since the CPU and the flash chip are connected through an FPGA in order to expand the addressable memory.
We have only 8 address lines available. But to make a long story short: I can't use generic program and erase functions.
2. I've tried to use the rtems flashdisk driver (rtems/flashdisk.h) and found the files \c\src\libchip\flash\am29lv160.c and am29lv160.h.
Guided by these files I wrote the following code:
===================================================================================================
========================================== fdisk_driver.c =========================================
#include "fdisk_driver.h"
#include "../flash/flashlib.h"
#include "../utils/utils.h"
#include "errno.h"
flash_device_t handle;
void init_flash_filesystem_driver(void)
{
flash_init((void*)FLASH_START_ADDR, &handle);
}
int fdisk_driver_read (const rtems_fdisk_segment_desc* sd,
uint32_t device,
uint32_t segment,
uint32_t offset,
void* buffer,
uint32_t size)
{
if(handle.size == 0)
return EIO;
unsigned char* addr = (unsigned char*)(handle.start_addr + (segment * sd->size) + offset);
copy_mem(addr, buffer, size);
return 0;
}
int fdisk_driver_write (const rtems_fdisk_segment_desc* sd,
uint32_t device,
uint32_t segment,
uint32_t offset,
const void* buffer,
uint32_t size)
{
if(handle.size == 0)
return EIO;
unsigned char* addr = (unsigned char*)(handle.start_addr + (segment * sd->size) + offset);
return flash_program(&handle, addr, buffer, size);;
}
int fdisk_driver_blank (const rtems_fdisk_segment_desc* sd,
uint32_t device,
uint32_t segment,
uint32_t offset,
uint32_t size)
{
uint32_t i;
unsigned char* addr = (unsigned char*)(handle.start_addr + (segment * sd->size) + offset);
for(i = 0; i < size; i++)
{
if(addr[i] != 0xff)
return EIO;
}
return 0;
}
int fdisk_driver_verify (const rtems_fdisk_segment_desc* sd,
uint32_t device,
uint32_t segment,
uint32_t offset,
const void* buffer,
uint32_t size)
{
uint32_t i;
unsigned char* addr = (unsigned char*) (handle.start_addr
+ (segment * sd->size) + offset);
unsigned char* cmp = (unsigned char*) buffer;
for (i = 0; i < size; i++) {
if (addr[i] != cmp[i])
return EIO;
}
return 0;
}
int fdisk_driver_erase (const rtems_fdisk_segment_desc* sd,
uint32_t device,
uint32_t segment)
{
if(handle.size == 0)
return EIO;
void* blk_addr = (void*)(segment * sd->size);
return flash_erase_block(&handle, blk_addr);
}
int fdisk_driver_erase_device (const struct rtems_fdisk_device_desc* dd,
uint32_t device)
{
printf("Erase Device.\n");
return 0;
}
const rtems_fdisk_driver_handlers driver_ops =
{
.read = fdisk_driver_read,
.write = fdisk_driver_write,
.blank = fdisk_driver_blank,
.verify = fdisk_driver_verify,
.erase = fdisk_driver_erase,
.erase_device = fdisk_driver_erase_device
};
const rtems_fdisk_segment_desc driver_segment_desc[1] =
{
{
.count = 1024,
.segment = 0,
.offset = 0,
.size = 131072
}
};
const rtems_fdisk_device_desc driver_device_desk[1] =
{
{
.segment_count = 1,
.segments = driver_segment_desc,
.flash_ops = &driver_ops
}
};
uint32_t rtems_flashdisk_configuration_size = 1;
const rtems_flashdisk_config rtems_flashdisk_configuration[1] =
{
{
.block_size = 1024,
.device_count = 1,
.devices = driver_device_desk,
// .flags = RTEMS_FDISK_BACKGROUND_ERASE | RTEMS_FDISK_BACKGROUND_COMPACT,
.flags = 0,
.unavail_blocks = 2048,
.compact_segs = 8,
.avail_compact_segs = 2,
.info_level = 0
}
};
===================================================================================================
===================================================================================================
===================================================================================================
============================================= main.c ==============================================
#include <rtems.h>
#include "rtems/blkdev.h"
#include "rtems/dosfs.h"
#include "rtems/flashdisk.h"
/* configuration information */
#define CONFIGURE_INIT
#include <bsp.h> /* for device driver prototypes */
rtems_task Init( rtems_task_argument argument); /* forward declaration needed */
/* configuration information */
#define CONFIGURE_INIT
#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
#define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
#define CONFIGURE_APPLICATION_NEEDS_LIBBLOCK
#define CONFIGURE_USE_IMFS_AS_BASE_FILESYSTEM
#define CONFIGURE_MAXIMUM_TASKS 10
#define CONFIGURE_RTEMS_INIT_TASKS_TABLE
#define CONFIGURE_EXTRA_TASK_STACKS (4 * RTEMS_MINIMUM_STACK_SIZE)
#define CONFIGURE_LIBIO_MAXIMUM_FILE_DESCRIPTORS 32
#define CONFIGURE_INIT_TASK_PRIORITY 100
#define CONFIGURE_MAXIMUM_DRIVERS 16
#define RTEMS_FDISK_TRACE 0
#include <rtems/confdefs.h>
/* If --drvmgr was enabled during the configuration of the RTEMS kernel */
#ifdef RTEMS_DRVMGR_STARTUP
#ifdef LEON3
/* Add Timer and UART Driver for this example */
#ifdef CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
#define CONFIGURE_DRIVER_AMBAPP_GAISLER_GPTIMER
#endif
#ifdef CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
#define CONFIGURE_DRIVER_AMBAPP_GAISLER_APBUART
#endif
#endif
#include <drvmgr/drvmgr_confdefs.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "filesystem/fdisk_driver.h"
rtems_task Init(
rtems_task_argument ignored
)
{
DIR* dir;
struct dirent* dp;
int status;
printf("Errno at the very beginning: %i\n", errno);
init_flash_filesystem_driver();
rtems_status_code rc;
rc = rtems_fdisk_initialize(/*major number*/ 99, 0, 0x0);
printf("Return Value of rtems_fdisk_initialize: %u\n", rc);
printf("Errno after rtems_fdisk_initialize: %i\n", errno);
printf("Files in /dev/:\n");
dir = opendir("/dev/");
while((dp = readdir(dir)) != NULL)
{
printf("%s\n", dp->d_name);
}
status = mkdir("/mnt/", S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
printf("Return value of mkdir: %i, errno: %i\n", status, errno);
printf("Files in root directory:\n");
dir = opendir("/");
while ((dp = readdir(dir)) != NULL) {
printf("%s\n", dp->d_name);
}
printf("Errno after opendir: %i\n", errno);
status = msdos_format("/dev/fdda", 0x0);
printf("Return value of msdos_format: %i, errno: %i\n", status, errno);
status = mount("/dev/fdda", "/mnt/", "vfat", 0, "mode=0666");
printf("Return value of mount: %i, errno: %i\n", status, errno);
exit( 0 );
}
===================================================================================================
===================================================================================================
Running the code produces the following output:
Errno at the very beginning: 0
Return Value of rtems_fdisk_initialize: 0
Errno after rtems_fdisk_initialize: 22
Files in /dev/:
console
console_b
fdda <= This should be the flashdisk device file
Return value of mkdir: 0, errno: 22
Files in root directory:
dev
mnt
Errno after opendir: 22
Return value of msdos_format: -1, errno: 9
Return value of mount: -1, errno: 22
Obviously something goes wrong but I have no idea why. Is this even the right approach or is there a much simpler solution for my problem?
I would appreciate any help.
Thanks in advance,
Phil
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