From: Scott Wood <scottwood@freescale.com>
To: Martyn Welch <martyn.welch@ge.com>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] PowerPC: Remove hardcoded BAT configuration of IMMR in CPM early debug console
Date: Wed, 02 Jun 2010 11:28:01 -0500 [thread overview]
Message-ID: <4C068691.6040501@freescale.com> (raw)
In-Reply-To: <4C0610F8.6020801@ge.com>
On 06/02/2010 03:06 AM, Martyn Welch wrote:
>>>> I think that's a more fundamental change to CPM early debug than I can
>>>> handle right now.
>>
>> Is IMMRBASE on your board at some address that has a low likelihood of
>> conflicting when treated as a kernel effective address?
>
> It's at 0x0f000000, is seems ok, but then I'm not sure I fully
> understand kernel effective addresses.
That overlaps userspace -- is the BAT cleared before userspace starts?
If you don't want to do the fixmap stuff, might want to at least just
leave it at the current arbitrary effective address, which hasn't seemed
to cause much trouble so far.
But fixmap is the right way to do it.
-Scott
next prev parent reply other threads:[~2010-06-02 16:28 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-28 15:18 [PATCH] PowerPC: Remove hardcoded BAT configuration of IMMR in CPM early debug console Martyn Welch
2010-05-28 16:18 ` Scott Wood
2010-05-29 3:37 ` Benjamin Herrenschmidt
2010-06-01 12:52 ` Martyn Welch
2010-06-01 13:43 ` Martyn Welch
2010-06-01 16:06 ` Scott Wood
2010-06-02 8:06 ` Martyn Welch
2010-06-02 16:28 ` Scott Wood [this message]
2010-06-03 9:12 ` Martyn Welch
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