Zack Buhman
62d6a3b2a6
Before this commit, attempting to start the rom on real NDS/DSi hardware would result in the display of a solid white screen, with no apparent evidence of the arm9 program running. After much testing, I found that this issue was directly caused "main mmeory" bus contention. Because arm7 and arm9 are both attempting to read instructions from ewram at the same time, and arm9 bus access stalls completely. I also found that this could not be mitigated with giving arm9 priority in EXMEMCNT. The solution appears to be to relocate arm7 code execution from main/shared memory to an arm7-internal memory. After this commit, the examples now function as intended on real NDS/DSi hardware.
54 lines
2.1 KiB
ArmAsm
54 lines
2.1 KiB
ArmAsm
.section .text.header
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.ascii "game title " /* Game Title */
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.ascii "####" /* Game Code */
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.ascii "00" /* Maker Code */
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.byte 0x0 /* Unit Code */
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.byte 0x0 /* Device type */
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.byte 0x0 /* Device capacity */
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.fill 7,1,0x0 /* Reserved */
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.byte 0x0 /* Reserved */
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.byte 0x0 /* NDS region */
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.byte 0x0 /* ROM version */
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.byte 0x0 /* Autostart */
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.long _arm9_offset /* ARM9 rom offset */
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.long _arm9_entry /* ARM9 entry address */
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.long _arm9_addr /* ARM9 ram address */
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.long _arm9_size /* ARM9 size */
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.long _arm7_offset /* ARM7 rom offset */
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.long _arm7_entry /* ARM7 entry address */
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.long _arm7_addr /* ARM7 ram address */
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.long _arm7_size /* ARM7 size */
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.long 0x00000000 /* File name table offset */
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.long 0x00000000 /* File name table size */
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.long 0x00000000 /* File allocation table offset */
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.long 0x00000000 /* file allocation table size */
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.long 0x00000000 /* ARM9 overlay offset */
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.long 0x00000000 /* ARM9 overlay size */
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.long 0x00000000 /* ARM7 overlay offset */
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.long 0x00000000 /* ARM7 overlay size */
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.long 0x00586000 /* 040001a4 setting for normal commands */
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.long 0x001808F8 /* 040001a4 setting for KEY1 commands */
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.long 0x00000000 /* Icon/Title offset */
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.short 0x4bff /* Secure Area Checksum */
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.short 0x0d7e /* Secure Area Delay */
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.long 0x00000000 /* ARM9 auto load list hook ram address */
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.long 0x00000000 /* ARM7 auto load list hook ram address */
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.fill 8,1,0x0 /* Secure Area Disable */
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.long _rom_size /* Total used rom size */
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.long _header_size /* ROM header size */
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.fill 4,1,0x0 /* Reserved */
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.fill 8,1,0x0 /* Reserved */
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.short 0x0000 /* NAND end of ROM area */
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.short 0x0000 /* NAND start of RW area */
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.fill 24,1,0x0 /* Reserved */
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.fill 16,1,0x0 /* Reserved */
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.include "logo.s" /* Nintendo logo */
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.short 0xcf56 /* Nintendo logo checksum */
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.short 0xffff /* Header checksum */
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.long 0x00000000 /* Debug rom offset */
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.long 0x00000000 /* Debug rom size */
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.long 0x00000000 /* Debug ram address */
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.fill 4,1,0x0 /* Reserved */
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.balign 0x8000,0x0 /* Padding */
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