From: Dan Malek <dan@embeddededge.com>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: linux-ppc-embedded <linuxppc-embedded@ozlabs.org>
Subject: Re: [PATCH] allow coherent DMA API to work before main page allocator is set up
Date: Sat, 21 May 2005 17:21:47 -0400 [thread overview]
Message-ID: <5d184282e7d324fb009b8dcf6e6f967d@embeddededge.com> (raw)
In-Reply-To: <20050520175152.GB26221@logos.cnet>
On May 20, 2005, at 1:51 PM, Marcelo Tosatti wrote:
> I must be missing something very obvious here, can you explain how
> did you arrange things in v2.4 such that the console's ->setup
> method is called _after_ mem_init() ?
The driver used to use the serial port configuration as left by the
boot rom until very late into the initialization. As I have said many
times in the past, the serial driver went through three different
levels of configuration. There was an early configuration that was
used for kgdb, a later one used by the serial kernel printk, and
finally a full configuration by the serial driver.
It's sad that "moving forward" is done at a cost of throwing away
features that were important. The hack to allocate from boot memory
is a quick fix, but this further ensures features like pinned TLB
entries won't work.
Thanks.
-- Dan
next prev parent reply other threads:[~2005-05-21 21:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-20 14:12 [PATCH] allow coherent DMA API to work before main page allocator is set up Marcelo Tosatti
2005-05-20 21:03 ` Dan Malek
2005-05-20 17:51 ` Marcelo Tosatti
2005-05-21 21:21 ` Dan Malek [this message]
2005-05-21 22:27 ` [RFT] 8xx cpm_hostalloc patch was: " Marcelo Tosatti
2005-05-23 6:27 ` Pantelis Antoniou
2005-05-23 15:19 ` Dan Malek
2005-05-27 15:48 ` [PATCH] PSC with devfs on 5200 Mark Chambers
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