Date: Fri, 18 Apr 2008 12:20:45 +0900 From: Sogabe Takashi <sogabe@iij.ad.jp> To: freebsd-drivers@freebsd.org Subject: Re: question: workaround for AX88190 (dev/ed/if_ed.c) Message-ID: <4808138D.2040408@iij.ad.jp> In-Reply-To: <20080416.132024.1649777798.imp@bsdimp.com> References: <4805BBA7.60806@iij.ad.jp> <20080416163938.GM95731@elvis.mu.org> <20080416.132024.1649777798.imp@bsdimp.com>
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I see buggy cards must be around here..
I think any other AX series(ax88796, etc.) may have similler
bugs, but I don't know how to confirm them.
Thanks,
--
sogabe@iij.ad.jp
> In message: <20080416163938.GM95731@elvis.mu.org>
> Alfred Perlstein <alfred@freebsd.org> writes:
> : I think the driver developer found the card buggy and wanted
> : to give it a longer try to clear the status bits, but if it
> : just flat out refuses to clear status, then it just aborts.
>
> Some versions of silicon seem to be better than others at this as
> well. Some cards need it, but most don't.
>
> Warner
>
>
> : * Sogabe Takashi <sogabe@iij.ad.jp> [080416 02:00] wrote:
> : > Hi all,
> : >
> : > Does anyone know what kind of problems about following
> : > workaround-code?
> : >
> : > I read asix datasheets, but corresponding problem is not
> : > described.
> : >
> : > (in sys/dev/ed/if_ed.c)
> : > /*
> : > * Ethernet interface interrupt processor
> : > */
> : > void
> : > edintr(void *arg)
> : > {
> : > ...
> : > /*
> : > * XXX workaround for AX88190
> : > * We limit this to 5000 iterations. At 1us per inb/outb,
> : > * this translates to about 15ms, which should be plenty
> : > * of time, and also gives protection in the card eject
> : > * case.
> : > */
> : > if (sc->chip_type == ED_CHIP_TYPE_AX88190) {
> : > count = 5000; /* 15ms */
> : > while (count-- && (ed_nic_inb(sc, ED_P0_ISR) & isr)) {
> : > ed_nic_outb(sc, ED_P0_ISR,0);
> : > ed_nic_outb(sc, ED_P0_ISR,isr);
> : > }
> : > if (count == 0)
> : > break;
> : > }
> : > ...
> : > }
> : >
> : > --
> : > sogabe@iij.ad.jp
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