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Re: [Xen-devel] [PATCH] xen: more robust serial port driver
| To: | Christoph Egger <Christoph.Egger@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] xen: more robust serial port driver |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 28 Jul 2009 15:58:41 +0100 |
| Cc: | |
| Delivery-date: | Tue, 28 Jul 2009 07:59:44 -0700 |
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| In-reply-to: | <200907281647.36341.Christoph.Egger@xxxxxxx> |
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| Thread-index: | AcoPkmGDPc+q47g3RPm5iTUYC/HtlgAAYN5E |
| Thread-topic: | [Xen-devel] [PATCH] xen: more robust serial port driver |
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On 28/07/2009 15:47, "Christoph Egger" <Christoph.Egger@xxxxxxx> wrote: >> Might this be the case for the udelay(100) as >> well? > > No. This ensures, that the write takes effect before the read happens. Can a read really overtake a write in this case? Seriously? >> And what kinds of systems have these broken UARTs that half-advertise >> a broken/non-existent FIFO? > > The original ns16550 has a broken FIFO. The ns16450 has no FIFO. > There are simulators which simulate those old things instead of a ns16550a. Hm, well, okay, the actual one line core of this patch actually seems okay to me. It's all the rest I want to drop on the floor. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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