Date: Wed, 17 Mar 1999 00:18:33 -0700 From: Wes Peters <wes@softweyr.com> To: "John W. DeBoskey" <jwd@unx.sas.com> Cc: freebsd-hackers@freebsd.org, Charles Tudor <sascht@unx.sas.com> Subject: Re: fxp driver causing lockup Message-ID: <36EF5749.2B1A8D21@softweyr.com> References: <199903170620.BAA54317@bb01f39.unx.sas.com>
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"John W. DeBoskey" wrote:
>
> Hi,
>
> I beleive you are correct. The following code fragment from
> if_fxp.c is the lockup:
>
> /*
> * Start the config command/DMA.
> */
> fxp_scb_wait(sc);
> CSR_WRITE_4(sc, FXP_CSR_SCB_GENERAL, vtophys(&cbp->cb_status));
> CSR_WRITE_1(sc, FXP_CSR_SCB_COMMAND, FXP_SCB_COMMAND_CU_START);
> /* ...and wait for it to complete. */
> while (!(cbp->cb_status & FXP_CB_STATUS_C));
Yup, that's it. I initially tracked this down under 3.0, but moved the
machine back to 2.2.7 because I needed it to get work done. I've now
stuffed two 3c905Bs into it for my main and test network, and can play
with the Pro 100B without losing a network connection.
> according to doc at Dell's website (they have a machine with this
> problem), the bios is not enabling dma on the adapter board. I beleive
> the person I copied on this mail can provide the precise web page
> that documents this.
>
> According to them, it is possible to discreetly turn on dma on
> the adapter. This is were someone with the appropriate doc needs
> to jump in...
>
> Basically, the driver needs to check that dma is enabled and
> enable it if not.
Any hints as to how to do that? I've got the machine, the lockups,
and a (little) bit of driver knowlege. Plus a fair bit of tenacity.
The Linux 2.2 driver exhibits the same problem on these machines, so I
can either share the fix with them or just convince them to upgrade
to FreeBSD once I get this nailed. ;^)
--
"Where am I, and what am I doing in this handbasket?"
Wes Peters Softweyr LLC
http://www.softweyr.com/~softweyr wes@softweyr.com
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