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PR: 214637 Submitted by: Michael Zhiling <mizhka@gmail.com> Approved by: lme (mentor), maintainer timeout (nukama+maintainer@gmail.com, 3 months) Differential Revision: https://reviews.freebsd.org/D9696
28 lines
1.1 KiB
C
28 lines
1.1 KiB
C
Avoid hang of serprog under FreeBSD
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Use case is flashrom+serprog to read SPI flash (MX25L6406) via Arduino
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Nano V3. Actual command is:
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/usr/local/bin/flashrom -p serprog:dev=/dev/cuaU0:57600 -c MX25L6406E/MX25L6408E -r tcw770.dump
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Using flashrom 0.9.9 it hangs after 5 seconds on read from tty ("ttyin").
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The problem is that kernel method "ttydisc_rint" ignore same bytes. It
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happens due to enabled IEXTEN local flag of termios. TTY cuts few bytes,
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Arduino reads 11264 bytes, but flashrom gets 11244 bytes (corrupted) and
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waits for remaining 20 bytes.
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The fix is simple: turn off IEXTEN local flag.
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https://patchwork.coreboot.org/patch/4498/
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--- serial.c.orig 2016-11-18 19:39:55 UTC
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+++ serial.c
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@@ -203,7 +203,7 @@ int serialport_config(fdtype fd, int bau
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}
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wanted.c_cflag &= ~(PARENB | CSTOPB | CSIZE | CRTSCTS);
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wanted.c_cflag |= (CS8 | CLOCAL | CREAD);
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- wanted.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
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+ wanted.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG | IEXTEN);
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wanted.c_iflag &= ~(IXON | IXOFF | IXANY | ICRNL | IGNCR | INLCR);
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wanted.c_oflag &= ~OPOST;
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if (tcsetattr(fd, TCSANOW, &wanted) != 0) {
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