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gamecart: Use the chip ID to determine the ROM size.

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Some development carts have an incorrect ROM header, but the cart ID
is always correct, so prefer the chip ID. If the chip ID is invalid
(unlikely), then fall back to the ROM header.
This commit is contained in:
David Korth 2020-11-12 20:33:31 -05:00 committed by d0k3
parent 01dd46ced3
commit cadd21508f
1 changed files with 21 additions and 2 deletions
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23
arm9/source/gamecart/gamecart.c
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@ -66,6 +66,23 @@ u32 InitCartRead(CartData* cdata) {
Cart_Init(); Cart_Init();
cdata->cart_id = Cart_GetID(); cdata->cart_id = Cart_GetID();
cdata->cart_type = (cdata->cart_id & 0x10000000) ? CART_CTR : CART_NTR; cdata->cart_type = (cdata->cart_id & 0x10000000) ? CART_CTR : CART_NTR;
// Use the cart ID to determine the ROM size.
// (ROM header might be incorrect on dev carts.)
switch ((cdata->cart_id >> 16) & 0xFF) {
case 0x07: cdata->cart_size = 8ULL*1024*1024; break;
case 0x0F: cdata->cart_size = 16ULL*1024*1024; break;
case 0x1F: cdata->cart_size = 32ULL*1024*1024; break;
case 0x3F: cdata->cart_size = 64ULL*1024*1024; break;
case 0x7F: cdata->cart_size = 128ULL*1024*1024; break;
case 0xFF: cdata->cart_size = 256ULL*1024*1024; break;
case 0xFE: cdata->cart_size = 512ULL*1024*1024; break;
case 0xFA: cdata->cart_size = 1024ULL*1024*1024; break;
case 0xF8: cdata->cart_size = 2048ULL*1024*1024; break;
case 0xF0: cdata->cart_size = 4096ULL*1024*1024; break;
default: cdata->cart_size = 0; break;
}
if (cdata->cart_type & CART_CTR) { // CTR cartridges if (cdata->cart_type & CART_CTR) { // CTR cartridges
memset(cdata, 0xFF, 0x4000 + PRIV_HDR_SIZE); // switch the padding to 0xFF memset(cdata, 0xFF, 0x4000 + PRIV_HDR_SIZE); // switch the padding to 0xFF
@ -85,7 +102,8 @@ u32 InitCartRead(CartData* cdata) {
NcchHeader* ncch = (NcchHeader*) (void*) ncch_header; NcchHeader* ncch = (NcchHeader*) (void*) ncch_header;
if ((ValidateNcsdHeader(ncsd) != 0) || (ValidateNcchHeader(ncch) != 0)) if ((ValidateNcsdHeader(ncsd) != 0) || (ValidateNcchHeader(ncch) != 0))
return 1; return 1;
cdata->cart_size = (u64) ncsd->size * NCSD_MEDIA_UNIT; if (cdata->cart_size == 0)
cdata->cart_size = (u64) ncsd->size * NCSD_MEDIA_UNIT;
cdata->data_size = GetNcsdTrimmedSize(ncsd); cdata->data_size = GetNcsdTrimmedSize(ncsd);
if (cdata->cart_size > 0x100000000) return 1; // carts > 4GB don't exist if (cdata->cart_size > 0x100000000) return 1; // carts > 4GB don't exist
// else if (cdata->cart_size == 0x100000000) cdata->cart_size -= 0x200; // silent 4GB fix // else if (cdata->cart_size == 0x100000000) cdata->cart_size -= 0x200; // silent 4GB fix
@ -113,7 +131,8 @@ u32 InitCartRead(CartData* cdata) {
// cartridge size, trimmed size, twl presets // cartridge size, trimmed size, twl presets
if (nds_header->device_capacity >= 15) return 1; // too big, not valid if (nds_header->device_capacity >= 15) return 1; // too big, not valid
cdata->cart_size = (128 * 1024) << nds_header->device_capacity; if (cdata->cart_size == 0)
cdata->cart_size = (128 * 1024) << nds_header->device_capacity;
cdata->data_size = nds_header->ntr_rom_size; cdata->data_size = nds_header->ntr_rom_size;
cdata->arm9i_rom_offset = 0; cdata->arm9i_rom_offset = 0;