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Dreamcast: GD_LEND should output number of bytes successfully DMA'd

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With this commit, Daytona USA 2001 boots.
This commit is contained in:
snickerbockers 2018-06-10 02:54:02 -07:00
parent a05aac02f5
commit ca0722e41b
2 changed files with 5 additions and 3 deletions
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3
src/mame/includes/dccons.h
View File

@ -18,6 +18,7 @@ public:
dc_cons_state(const machine_config &mconfig, device_type type, const char *tag)
: dc_state(mconfig, type, tag)
, m_ata(*this, "ata")
, atapi_xfercomplete(0)
// , m_dcflash(*this, "dcflash")
{ }
@ -55,7 +56,7 @@ public:
private:
uint64_t PDTRA, PCTRA;
emu_timer *atapi_timer;
int atapi_xferlen, atapi_xferbase;
int atapi_xferlen, atapi_xferbase, atapi_xfercomplete;
};
#endif // MAME_INCLUDES_DCCONS_H

5
src/mame/machine/dccons.cpp
View File

@ -49,7 +49,7 @@ TIMER_CALLBACK_MEMBER(dc_cons_state::atapi_xfer_end )
//osd_printf_debug("ATAPI: xfer_end. xferlen = %d\n", atapi_xferlen);
m_ata->write_dmack(1);
atapi_xfercomplete = 0;
while (atapi_xferlen > 0 )
{
struct sh4_ddt_dma ddtdata;
@ -63,6 +63,7 @@ TIMER_CALLBACK_MEMBER(dc_cons_state::atapi_xfer_end )
}
atapi_xferlen -= 2048;
atapi_xfercomplete += 2048;
// perform the DMA
ddtdata.destination = atapi_xferbase; // destination address
@ -125,7 +126,7 @@ READ32_MEMBER(dc_cons_state::dc_mess_g1_ctrl_r )
break;
case SB_GDLEND:
//machine().debug_break();
return atapi_xferlen; // TODO: check me
return atapi_xfercomplete;
case SB_SECUR_EADR: // always read 0xFF on hardware
return 0x000000ff;
case SB_SECUR_STATE: // state of BIOS checksum security system (R/O):