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- Log -----------------------------------------------------------------
commit 09b44b0d5e40e9302a71c9269e7df36c08377f1a
Author: Zack Buhman <za...@bu...>
Date: Sat May 17 16:14:49 2025 -0500
scif: disable MCE by default
Enabling MCE is not a reasonable library default because the typical USB-UARTs
that are connected to the Dreamcast have large ~1024 byte TX/RX buffers and the
maximum Dreamcast SCIF baud rate is slow compared to the capabilities of these
chips.
Given the use-case for scif.c appears to be to allow for synchronously-blocking
debug prints over scif, from a library/policy perspective MCE should be
considered a "specialized" configuration.
For KallistiOS users, the behavior prior to this commit was:
- serial transmission may be silently permanently disabled due to the SCIF CTS
pin being disconnected or tied high
- it is not possible to use RTS/CTS as GPIO pins while also using scif.c
-----------------------------------------------------------------------
Summary of changes:
kernel/arch/dreamcast/hardware/scif.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/arch/dreamcast/hardware/scif.c b/kernel/arch/dreamcast/hardware/scif.c
index 4ceab8ca..70b7254b 100644
--- a/kernel/arch/dreamcast/hardware/scif.c
+++ b/kernel/arch/dreamcast/hardware/scif.c
@@ -242,8 +242,8 @@ int scif_init(void) {
for(i = 0; i < 800000; i++)
__asm__("nop");
- /* Unreset, enable hardware flow control, triggers on 8 bytes */
- SCFCR2 = 0x48;
+ /* Unreset, disable hardware flow control, triggers on 8 bytes */
+ SCFCR2 = 0x40;
/* Disable manual pin control */
SCSPTR2 = 0;
hooks/post-receive
--
A pseudo Operating System for the Dreamcast.
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