From: Gabe Black <gblack@eecs.umich.edu>
Date: Sat, 9 Oct 2010 19:41:31 +0000 (-0700)
Subject: UART: Make the 8250's MCR return a deterministic value.
X-Git-Tag: stable_2012_02_02~795
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9268f895d522a10f176099218df35bfe9111b7a9;p=gem5.git

UART: Make the 8250's MCR return a deterministic value.

This change makes the 8250 device return the value it has for the MCR when
read instead of leaving the packet data unmodified/uninitialized. The value
the UART has for the MCR may not be right, but that's a seperate issue that
apparently hasn't caused any problems to date.
---

diff --git a/src/dev/uart8250.cc b/src/dev/uart8250.cc
index 2bbcf2683..f8bd23311 100644
--- a/src/dev/uart8250.cc
+++ b/src/dev/uart8250.cc
@@ -161,6 +161,7 @@ Uart8250::read(PacketPtr pkt)
             pkt->set(LCR);
             break;
         case 0x4: // Modem Control Register (MCR)
+            pkt->set(MCR);
             break;
         case 0x5: // Line Status Register (LSR)
             uint8_t lsr;