[S] Change in flashrom[master]: serial.c: support BAUD rates > 230400 on macOS

[Name of user not set (Code Review)]

Name of user not set #1004601 has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/67822 )

Change subject: serial.c: support BAUD rates > 230400 on macOS
......................................................................

serial.c: support BAUD rates > 230400 on macOS

use the apple way to set BAUD rates > 2000000 on macOS.

Signed-off-by: Denis Ahrens 
Change-Id: I9c67048b9c7bc704d9b0c4ef4771f708fdb3e0f3
---
M serial.c
1 file changed, 36 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/22/67822/1

diff --git a/serial.c b/serial.c
index 72f9ef6..1a22228 100644
--- a/serial.c
+++ b/serial.c
@@ -36,6 +36,10 @@
 #include "programmer.h"
 #include "custom_baud.h"

+#ifdef __APPLE__
+#include <IOKit/serial/ioss.h>
+#endif
+
 fdtype sp_fd = SER_INV_FD;

/* There is no way defined by POSIX to use arbitrary baud rates. It only defines some macros that can be used to
@@ -185,6 +189,14 @@
    	return 1;
    }
    wanted = observed;
+#ifdef __APPLE__
+	int fakebaud = 0;
+	if (baud > 230400)
+	{
+		fakebaud = baud;
+		baud = 19200;
+	}
+#endif
    if (baud >= 0) {
    	if (use_custom_baud(baud, sp_baudtable)) {
    		if (set_custom_baudrate(fd, baud)) {
@@ -244,6 +256,18 @@
    }
    // FIXME: display actual baud rate - at least if none was specified by the user.
 #endif
+
+#ifdef __APPLE__
+	if (fakebaud)
+	{
+		cfmakeraw(&wanted);
+		if (ioctl(fd, IOSSIOSPEED, &fakebaud) == -1) {
+			msg_perr("[WARN] ioctl(..., IOSSIOSPEED, %d).\n", fakebaud);
+			msg_perr_strerror("problem with IOSSIOSPEED");
+			return 1;
+        }
+	}
+#endif
    return 0;
 }