From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] OMAP1/2/3/4: DEBUG_LL run time detection
Date: Sat, 19 Sep 2009 09:40:52 +0100 [thread overview]
Message-ID: <20090919084051.GA20296@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1253320780-19396-2-git-send-email-vikram.pandita@ti.com>
On Fri, Sep 18, 2009 at 07:39:39PM -0500, Vikram Pandita wrote:
> The decision of finding the physical address of debug uart is done
> at runtime now, making possible to use a single defconfig for multiple boards.
>
> This patch gets rid of menuconfig options of choosing low level debug uarts.
This approach won't work in all cases where the debug functions are called
(which can be before the MMU is enabled.)
The problem is that you can't run C code before the MMU is setup because
C code always encodes absolute address locations, which won't be valid
at that time.
Also, since there is no stack during the initial kernel boot, you can't
stack registers in the LL debug functions.
prev parent reply other threads:[~2009-09-19 8:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-19 0:39 [PATCH v3 0/2] Cleanup DEBUG_LL infrastructure Vikram Pandita
2009-09-19 0:39 ` [PATCH 1/2] OMAP1/2/3/4: DEBUG_LL run time detection Vikram Pandita
2009-09-19 0:39 ` [PATCH 2/2] OMAP: Zoom2: Add DEBUG_LL interface using Quart Vikram Pandita
2009-09-19 5:35 ` [PATCH 1/2] OMAP1/2/3/4: DEBUG_LL run time detection Shilimkar, Santosh
2009-09-19 8:40 ` Russell King - ARM Linux [this message]
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