Messages in this thread | | | Date | Thu, 19 May 2011 10:09:16 -0500 | From | Timur Tabi <> | Subject | Re: [PATCH 6/7] tty/powerpc: introduce the ePAPR embedded hypervisor byte channel driver |
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Arnd Bergmann wrote: > Why is this using a full tty driver instead of the hvc framework that most > other hypervisor consoles use?
Because HVC uses the same interface for consoles and tty, and that resulted in dropped characters if the client driver returns EAGAIN because it's output buffer is full. I posted a patch that "fixes" this, but it was rejected. Here's the original patch:
http://lists.ozlabs.org/pipermail/linuxppc-dev/2010-August/085136.html
And here's the thread discussing our concerns:
http://lists.ozlabs.org/pipermail/linuxppc-dev/2010-September/thread.html
(search for "fix dropping of characters when output byte channel is full")
-- Timur Tabi Linux kernel developer at Freescale
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