The patch titled
serial: set DTR in uart for kernel serial console
has been added to the -mm tree. Its filename is
serial-set-dtr-in-uart-for-kernel-serial-console.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: serial: set DTR in uart for kernel serial console
From: Yinghai Lu <Yinghai.Lu@xxxxxxx>
Some UARTs on other side need host uart DTR is set, otherwise will not
receive char from the host that kernel is runing during kernel boot stage.
BTW: earlyprintk and early_uart are hard coded to set DTR/RTS.
Signed-off-by: Yinghai Lu <yinghai.lu@xxxxxxx>
Cc: Russell King <rmk@xxxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: Bjorn Helgaas <bjorn.helgaas@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/serial/8250.c | 5 +++++
1 files changed, 5 insertions(+)
diff -puN drivers/serial/8250.c~serial-set-dtr-in-uart-for-kernel-serial-console drivers/serial/8250.c
--- a/drivers/serial/8250.c~serial-set-dtr-in-uart-for-kernel-serial-console
+++ a/drivers/serial/8250.c
@@ -2397,6 +2397,11 @@ static void __init serial8250_isa_init_p
up->mcr_force = ALPHA_KLUDGE_MCR;
up->port.ops = &serial8250_pops;
+
+ /* some uarts on other side don't support no flow control. So we set
+ * DTR in host uart to make them happy --- YHLU
+ */
+ up->port.mctrl |= TIOCM_DTR;
}
for (i = 0, up = serial8250_ports;
_
Patches currently in -mm which might be from Yinghai.Lu@xxxxxxx are
serial-set-dtr-in-uart-for-kernel-serial-console.patch
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