Commit d05a8628 authored by Michael Davidsaver's avatar Michael Davidsaver Committed by Peter Maydell
Browse files

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: default avatarMichael Davidsaver <mdavidsaver@gmail.com>
Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Message-id: 1484938222-1423-1-git-send-email-peter.maydell@linaro.org
[PMM: expand commit message]
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent 056f43df

hw/net/stellaris_enet.c

+4 −1
Original line number Diff line number Diff line
@@ -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;