From df3f457b4b3a910de575b39bfa11d9a41330077c Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Mon, 12 Sep 2011 15:43:31 +0100 Subject: [PATCH] hw/integratorcp: Fix bugs in writes to CM_CTRL system register Fix a number of bugs in the implementation of writes to the CM_CTRL system register: * write to cm_ctrl, not cm_init ! * an '&' vs '^' typo meant we would write the inverse of the bits * handling the LED via printf() meant we spew lots of output to stdout when Linux uses the LED as a heartbeat indicator * we would hw_error() if a reset was requested rather than actually resetting Signed-off-by: Peter Maydell Signed-off-by: Anthony Liguori --- hw/integratorcp.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/hw/integratorcp.c b/hw/integratorcp.c index 3c8982ea29..9a289b4776 100644 --- a/hw/integratorcp.c +++ b/hw/integratorcp.c @@ -14,6 +14,7 @@ #include "arm-misc.h" #include "net.h" #include "exec-memory.h" +#include "sysemu.h" typedef struct { SysBusDevice busdev; @@ -126,15 +127,20 @@ static void integratorcm_do_remap(integratorcm_state *s, int flash) static void integratorcm_set_ctrl(integratorcm_state *s, uint32_t value) { if (value & 8) { - hw_error("Board reset\n"); + qemu_system_reset_request(); } - if ((s->cm_init ^ value) & 4) { + if ((s->cm_ctrl ^ value) & 4) { integratorcm_do_remap(s, (value & 4) == 0); } - if ((s->cm_init ^ value) & 1) { - printf("Green LED %s\n", (value & 1) ? "on" : "off"); + if ((s->cm_ctrl ^ value) & 1) { + /* (value & 1) != 0 means the green "MISC LED" is lit. + * We don't have any nice place to display LEDs. printf is a bad + * idea because Linux uses the LED as a heartbeat and the output + * will swamp anything else on the terminal. + */ } - s->cm_init = (s->cm_init & ~ 5) | (value ^ 5); + /* Note that the RESET bit [3] always reads as zero */ + s->cm_ctrl = (s->cm_ctrl & ~5) | (value & 5); } static void integratorcm_update(integratorcm_state *s) -- 2.11.4.GIT