Messages in this thread | | | Date | Sat, 10 Jul 2010 11:51:52 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [RFC/PATCH] x86: Early-boot serial I/O support |
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On 07/10/2010 11:07 AM, Pekka Enberg wrote: > This patch adds serial I/O support to very early boot printf(). It's useful for > debugging boot code when running Linux under KVM, for example. The actual code > was lifted from early printk.
Yinghai is correct that this really needs to pick apart the command line, especially since there is already support for command-line parsing in the early boot code. I suggest we just reuse the earlyprintk= option, especially since it's basically the same code and so should have the same failure profile.
> + > + while ((inb(early_serial_base + LSR)& XMTRDY) == 0&& --timeout) > + ; > +
cpu_relax(); here, probably.
-hpa
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