From d05a86285cacdcbfdd97e437d156545666fa5641 Mon Sep 17 00:00:00 2001 From: Michael Davidsaver Date: Fri, 27 Jan 2017 15:20:25 +0000 Subject: [PATCH] arm: stellaris: make MII accesses complete immediately When the guest attempts to start an MII register access via the MCTL register, clear the START bit, so that when the guest reads it back the register transaction will be signalled as having completed. This avoids the guest spinning as it polls the START bit waiting for it to clear (which it previously never would). The MII registers themselves still aren't implemented, but at least we can avoid guests spending quite so much time busy waiting. Signed-off-by: Michael Davidsaver Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell Message-id: 1484938222-1423-1-git-send-email-peter.maydell@linaro.org [PMM: expand commit message] Signed-off-by: Peter Maydell --- hw/net/stellaris_enet.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/hw/net/stellaris_enet.c b/hw/net/stellaris_enet.c index 957730e023..04bd10ada3 100644 --- a/hw/net/stellaris_enet.c +++ b/hw/net/stellaris_enet.c @@ -416,7 +416,10 @@ static void stellaris_enet_write(void *opaque, hwaddr offset, s->thr = value; break; case 0x20: /* MCTL */ - s->mctl = value; + /* TODO: MII registers aren't modelled. + * Clear START, indicating that the operation completes immediately. + */ + s->mctl = value & ~1; break; case 0x24: /* MDV */ s->mdv = value;