Re: [microblaze-uclinux] OPB Ethernet Lite sleeping until internal ping

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Giulio and others,

We've found the cause of this problem - it arises because the device 
receives packets before Linux brings up the interface.  When the driver 
the enables interrupts it doesn't check to see if any had already come. 
 The solution is simple - please try the following patch to

linux-2.6.x/drivers/net/xilinx_emaclite/xemaclite_intr.c

Regards,

John

Index: linux-2.6.x-petalogix/drivers/net/xilinx_emaclite/xemaclite_intr.c
===================================================================
--- linux-2.6.x-petalogix/drivers/net/xilinx_emaclite/xemaclite_intr.c 
(revision 4067)
+++ linux-2.6.x-petalogix/drivers/net/xilinx_emaclite/xemaclite_intr.c 
(revision 4092)
@@ -106,6 +106,6 @@
               XEL_BUFFER_OFFSET, Register);

-    Register = XIo_In32(InstancePtr->BaseAddress + XEL_RSR_OFFSET);
-    Register |= XEL_RSR_RECV_IE_MASK;
+/*    Register = XIo_In32(InstancePtr->BaseAddress + XEL_RSR_OFFSET); */
+    Register = XEL_RSR_RECV_IE_MASK;
     XIo_Out32(InstancePtr->BaseAddress + XEL_RSR_OFFSET, Register);
     XIo_Out32(InstancePtr->BaseAddress + XEL_RSR_OFFSET +


Giulio Mazzoleni wrote:
> Hi John,
> glad to see I'm not the only one facing this problem.
> > I've seen this too, and we're looking at a fix.  The driver looks 
> > correct, and checking the hardware status registers after boot shows 
> > interrupts enabled as they should be.  It's almost as though the core 
> > itself needs an outbound packet before it wakes up.  I hope this is 
> > not the case.  If so, a nasty hack might be for the driver 
> > initialisation to send a bogus packet just to wake things up.
> Many thanks for your interest and good luck for the fixing!
> Sorry for not being of any help to you.
>
> Cheers,
> Giulio
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