From: cyril@ti•com (Cyril Chemparathy)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 02/14] omap: Make uncompress code and DEBUG_LL code generic
Date: Fri, 30 Apr 2010 12:20:35 -0400 [thread overview]
Message-ID: <4BDB0353.5090800@ti.com> (raw)
In-Reply-To: <1272640022.3051.1534.camel@localhost>
Hi,
[...]
> To fix both problems, maybe we should just use a fixed memory location
> to pass this temporary data from uncompress to the kernel. We've had a
> similar problem on DaVinci recently and a proposal has been made (and
> tested) to use memory just below the page tables[3].)
Essentially both of these approaches (internal scratch register and
fixed address) implement a weird back-channel communication scheme
between the decompresser and the debug macros.
A more elegant solution may be as follows:
- pass machine_arch_type as an argument into addruart.
- move the uart base lookup logic to addruart using macros similar
to DEBUG_LL_*, except that these expand to assembly code this
time.
- reuse these debug-macros in uncompress.h and implement putc() and
flush() using addruart(), senduart(), etc.
This way, both the decompresser and the kernel debug macros end up using
machine_arch_type to get to the right debug uart, without resorting to
underhand back-channel tricks.
Any thoughts?
-- Cyril.
next prev parent reply other threads:[~2010-04-30 16:20 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-26 20:12 [PATCH 00/14] omap DEBUG_LL and multiboot changes for 2.6.34 Tony Lindgren
2010-01-26 20:12 ` [PATCH 01/14] omap: Clean the serial port defines Tony Lindgren
2010-01-26 20:12 ` [PATCH 02/14] omap: Make uncompress code and DEBUG_LL code generic Tony Lindgren
2010-04-29 14:44 ` Kevin Hilman
2010-04-30 15:07 ` Kevin Hilman
2010-04-30 16:20 ` Cyril Chemparathy [this message]
2010-04-30 16:49 ` Tony Lindgren
2010-04-30 17:18 ` Russell King - ARM Linux
2010-04-30 18:47 ` Tony Lindgren
2010-04-30 21:16 ` Kevin Hilman
2010-01-26 20:12 ` [PATCH 03/14] omap: Remove old DEBUG_LL serial port options Tony Lindgren
2010-01-26 20:12 ` [PATCH 04/14] omap2/3: Make get_irqnr_and_base common for mach-omap2 multiboot Tony Lindgren
2010-01-26 20:12 ` [PATCH 05/14] omap2/3: Multiboot compile fixes to compile in omap2 and omap3 Tony Lindgren
2010-01-26 20:12 ` [PATCH 06/14] omap: Fix dmtimer.c for multi-omap boot Tony Lindgren
2010-01-26 20:12 ` [PATCH 07/14] omap2/3/4: Fix omap2_map_common_io for multi-omap Tony Lindgren
2010-01-26 20:12 ` [PATCH 08/14] omap2/3/4: Fix mbox init " Tony Lindgren
2010-01-26 20:12 ` [PATCH 09/14] omap2: Convert ARCH_OMAP24XX to ARCH_OMAP2 Tony Lindgren
2010-01-26 20:12 ` [PATCH 10/14] omap3: Replace ARCH_OMAP34XX with ARCH_OMAP3 Tony Lindgren
2010-01-26 20:13 ` [PATCH 11/14] omap2/3/4: Replace orred CONFIG_ARCH_OMAP2/3/4 with CONFIG_ARCH_OMAP2PLUS Tony Lindgren
2010-01-26 20:13 ` [PATCH 12/14] omap2/3: Fix initcalls for multi-omap Tony Lindgren
[not found] ` <20100819090313.GC3003@shisha.kicks-ass.net>
2010-08-19 9:35 ` Tony Lindgren
2010-01-26 20:13 ` [PATCH 13/14] omap2/3: Fix powerdomain init for multiomap Tony Lindgren
2010-01-27 2:26 ` Paul Walmsley
2010-01-27 2:29 ` Tony Lindgren
2010-01-26 20:13 ` [PATCH 14/14] omap2/3: Update omap3_defconfig to build in all the 2420 based boards Tony Lindgren
2010-03-24 11:43 ` [PATCH 00/14] omap DEBUG_LL and multiboot changes for 2.6.34 Gadiyar, Anand
2010-04-01 12:13 ` Tony Lindgren
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