GBA NDS FAT
From DLDIWiki
gba_nds_fat was the first attempt by Chishm at a FAT file system library for the DS and GBA. It has bugs that can cause corruption of the file system of a memory card and has been deprecated in favour of libfat. It does not have built in support for DLDI, but it can be added by an application's developer.
[edit] Adding support for DLDI
Save the following as io_dldi.h:
/*
io_dldi.h
Reserved space for new drivers
This software is completely free. No warranty is provided.
If you use it, please give me credit and email me about your
project at chishm@hotmail.com
See gba_nds_fat.txt for help and license details.
*/
#ifndef IO_DLDI_H
#define IO_DLDI_H
// 'DLDI'
#define DEVICE_TYPE_DLDI 0x49444C44
#include "disc_io.h"
#ifdef NDS
#include <nds/memory.h>
#endif
extern IO_INTERFACE _io_dldi;
// export interface
static inline LPIO_INTERFACE DLDI_GetInterface(void) {
#ifdef NDS
WAIT_CR &= ~(ARM9_OWNS_ROM | ARM9_OWNS_CARD);
#endif // defined NDS
return &_io_dldi;
}
#endif // define IO_DLDI_H
Save the following as io_dldi.s:
@---------------------------------------------------------------------------------
.align 4
.arm
.global _io_dldi
@---------------------------------------------------------------------------------
.equ FEATURE_MEDIUM_CANREAD, 0x00000001
.equ FEATURE_MEDIUM_CANWRITE, 0x00000002
.equ FEATURE_SLOT_GBA, 0x00000010
.equ FEATURE_SLOT_NDS, 0x00000020
_dldi_start:
@---------------------------------------------------------------------------------
@ Driver patch file standard header -- 16 bytes
.word 0xBF8DA5ED @ Magic number to identify this region
.asciz " Chishm" @ Identifying Magic string (8 bytes with null terminator)
.byte 0x01 @ Version number
.byte 0x0F @32KiB @ Log [base-2] of the size of this driver in bytes.
.byte 0x00 @ Sections to fix
.byte 0x0F @32KiB @ Log [base-2] of the allocated space in bytes.
@---------------------------------------------------------------------------------
@ Text identifier - can be anything up to 47 chars + terminating null -- 16 bytes
.align 4
.asciz "Default (No interface)"
@---------------------------------------------------------------------------------
@ Offsets to important sections within the data -- 32 bytes
.align 6
.word _dldi_start @ data start
.word _dldi_end @ data end
.word 0x00000000 @ Interworking glue start -- Needs address fixing
.word 0x00000000 @ Interworking glue end
.word 0x00000000 @ GOT start -- Needs address fixing
.word 0x00000000 @ GOT end
.word 0x00000000 @ bss start -- Needs setting to zero
.word 0x00000000 @ bss end
@---------------------------------------------------------------------------------
@ IO_INTERFACE data -- 32 bytes
_io_dldi:
.ascii "DLDI" @ ioType
.word 0x00000000 @ Features
.word _DLDI_startup @
.word _DLDI_isInserted @
.word _DLDI_readSectors @ Function pointers to standard device driver functions
.word _DLDI_writeSectors @
.word _DLDI_clearStatus @
.word _DLDI_shutdown @
@---------------------------------------------------------------------------------
_DLDI_startup:
_DLDI_isInserted:
_DLDI_readSectors:
_DLDI_writeSectors:
_DLDI_clearStatus:
_DLDI_shutdown:
mov r0, #0x00 @ Return false for every function
bx lr
@---------------------------------------------------------------------------------
.align
.pool
.space 32632 @ Fill to 32KiB
_dldi_end:
.end
@---------------------------------------------------------------------------------
Put both of these files into your gba_nds_fat source directory.
In disc_io.c, under the line // Include known io-interfaces:, add the line #include "io_mpcf.h".
In the function bool disc_setGbaSlotInterface (void) add the following code before the line #ifdef SUPPORT_M3CF:
// check if we have a valid DLDI driver
active_interface = DLDI_GetInterface() ;
if (active_interface->fn_StartUp())
{
// set the DLDI driver as the default IO
return true ;
} ;
In the function bool disc_setDsSlotInterface (void) add the same block of code just before the line #ifdef SUPPORT_NMMC.
You should now be able to patch your application with DLDI files.
