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amic: Return random value for SCC DMA Rcv.

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This allows Mac OS 8.5 and Mac OS 8.5.1 to boot from SCSI of Power Mac 6100.
This commit is contained in:
joevt
2025-04-27 00:22:34 -07:00
committed by Maxim Poliakovski
parent b05dec8778
commit fa5e8b0bf8
1 changed files with 17 additions and 0 deletions
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devices/ioctrl/amic.cpp
+17
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@@ -217,8 +217,25 @@ uint32_t AMIC::read(uint32_t rgn_start, uint32_t offset, int size)
return this->floppy_dma->read_stat();
case SCC_DMA_Xmt_A_Ctrl:
return this->escc_xmit_a_dma->read_stat();
case SCC_RXA_Byte_Cnt_Hi:
return 0;
case SCC_RXA_Byte_Cnt_Lo:
return 0;
case SCC_DMA_Rcv_A_Ctrl: {
uint32_t value = std::rand() & (-1U >> (32 - size * 8));
LOG_F(WARNING, "AMIC SCC Receive Ch A DMA Ctrl read @%x.%c = %0*x", offset, SIZE_ARG(size), size * 2, value);
return value;
}
case SCC_DMA_Xmt_B_Ctrl:
return this->escc_xmit_b_dma->read_stat();
case SCC_RXB_Byte_Cnt_Hi:
return 0;
case SCC_RXB_Byte_Cnt_Lo:
return 0;
case SCC_DMA_Rcv_B_Ctrl: {
uint32_t value = std::rand() & (-1U >> (32 - size * 8));
LOG_F(WARNING, "AMIC SCC Receive Ch B DMA Ctrl read @%x.%c = %0*x", offset, SIZE_ARG(size), size * 2, value);
return value;
default:
LOG_F(WARNING, "Unknown AMIC register read, offset=%x", offset);
}