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From: Greg Ungerer <gerg@snapgear.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-m68k@vger.kernel.org, uclinux-dev@uclinux.org,
	Greg Ungerer <gerg@uclinux.org>
Subject: Re: [PATCH 17/35] m68k: define PAGE_OFFSET_RAW for ColdFire CPU with MMU enabled
Date: Tue, 27 Dec 2011 22:08:58 +1000	[thread overview]
Message-ID: <4EF9B55A.7000106@snapgear.com> (raw)
In-Reply-To: <CAMuHMdUUAsHRWHh4PukFJBM187UB_xj-R5rrs1+WuhtJmEO7tQ@mail.gmail.com>

Hi Geert,

On 12/26/2011 06:15 AM, Geert Uytterhoeven wrote:
> On Fri, Dec 23, 2011 at 04:15,<gerg@snapgear.com>  wrote:
>> From: Greg Ungerer<gerg@uclinux.org>
>>
>> The ColdFire CPU configurations need PAGE_OFFSET_RAW set to the base of
>> their RAM. It doesn't matter if they are running with the MMU enabled or
>> disabled, it is always set to the base of RAM.
>>
>> We can keep the choices simple here and key of CONFIG_RAMBASE. If it is
>> defined we are on a plaftorm (ColdFire or other non-MMU systems) which
>> have a configurable RAM base, just use it.
>>
>> Reported-by: Alexander Stein<alexander.stein@systec-electronic.com>
>> Signed-off-by: Greg Ungerer<gerg@uclinux.org>
>> Acked-by: Matt Waddel<mwaddel@yahoo.com>
>> Acked-by: Kurt Mahan<kmahan@xmission.com>
>
> Acked-by: Geert Uytterhoeven<geert@linux-m68k.org>
>
> but see below ...
>
>> -#ifdef CONFIG_MMU
>> -#ifndef CONFIG_SUN3
>> +#if defined(CONFIG_RAMBASE)
>> +#define PAGE_OFFSET_RAW	CONFIG_RAMBASE
>> +#elif !defined(CONFIG_SUN3)
>>  #define PAGE_OFFSET_RAW	0x00000000
>>  #else
>>  #define PAGE_OFFSET_RAW	0x0E000000
>>  #endif
>> -#else
>> -#define PAGE_OFFSET_RAW	CONFIG_RAMBASE
>> -#endif
>
> To avoid alternating between defined and !defined, I'd suggest writing
> it instead like:
>
> #if defined(CONFIG_RAMBASE)
> #define PAGE_OFFSET_RAW         CONFIG_RAMBASE
> #elif defined(CONFIG_SUN3)
> #define PAGE_OFFSET_RAW         0x0E000000
> #else
> #define PAGE_OFFSET_RAW         0x00000000
> #endif

Yep, absolutely, that is nicer. I'll change it to this.

Thanks
Greg


------------------------------------------------------------------------
Greg Ungerer  --  Principal Engineer        EMAIL:     gerg@snapgear.com
SnapGear Group, McAfee                      PHONE:       +61 7 3435 2888
8 Gardner Close,                            FAX:         +61 7 3891 3630
Milton, QLD, 4064, Australia                WEB: http://www.SnapGear.com

  reply	other threads:[~2011-12-27 12:09 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-23  3:15 [PATCH 00/35 v4] m68k: ColdFire MMU support gerg
2011-12-23  3:15 ` [PATCH 01/35] m68k: add machine and CPU definitions for ColdFire cores gerg
2011-12-23  3:15 ` [PATCH 02/35] m68k: show ColdFire CPU/FPU/MMU type gerg
2011-12-23  3:15 ` [PATCH 03/35] m68k: definitions for the ColdFire V4e MMU hardware gerg
2011-12-23  3:15 ` [PATCH 04/35] m68k: make interrupt definitions conditional on correct CPU types gerg
2011-12-23  3:15 ` [PATCH 05/35] m68k: add TASK definitions for ColdFires running with MMU gerg
2011-12-23  3:15 ` [PATCH 06/35] m68k: modify user space access functions to support ColdFire CPUs gerg
2011-12-25 19:56   ` Geert Uytterhoeven
2011-12-23  3:15 ` [PATCH 07/35] m68k: use addr_limit checking for m68k CPUs that do no support address spaces gerg
2011-12-25 20:01   ` Geert Uytterhoeven
2011-12-27 12:30     ` Greg Ungerer
2011-12-23  3:15 ` [PATCH 08/35] m68k: init the MMU hardware for the 54xx ColdFire gerg
2011-12-23  3:15 ` [PATCH 09/35] m68k: add ColdFire 54xx CPU MMU memory init code gerg
2011-12-25 20:05   ` Geert Uytterhoeven
2011-12-23  3:15 ` [PATCH 10/35] m68k: set register a2 to current if MMU enabled on ColdFire gerg
2011-12-25 20:09   ` Geert Uytterhoeven
2011-12-23  3:15 ` [PATCH 11/35] m68k: page table support definitions and code for ColdFire MMU gerg
2011-12-23  3:15 ` [PATCH 12/35] m68k: add page table size definitions for ColdFire V4e MMU gerg
2011-12-23  3:15 ` [PATCH 13/35] m68k: add ColdFire paging exception handling code gerg
2011-12-23  3:15 ` [PATCH 14/35] m68k: add cache support for V4e ColdFire cores running with MMU enabled gerg
2011-12-23  3:15 ` [PATCH 15/35] m68k: modify ColdFire 54xx cache support for " gerg
2011-12-23  3:15 ` [PATCH 16/35] m68k: add TLB flush support for the ColdFire V4e MMU hardware gerg
2011-12-23  3:15 ` [PATCH 17/35] m68k: define PAGE_OFFSET_RAW for ColdFire CPU with MMU enabled gerg
2011-12-25 20:15   ` Geert Uytterhoeven
2011-12-27 12:08     ` Greg Ungerer [this message]
2011-12-23  3:15 ` [PATCH 18/35] m68k: set ColdFire MMU page size gerg
2011-12-23  3:15 ` [PATCH 19/35] m68k: MMU enabled ColdFire needs 8k ELF alignment gerg
2011-12-23  3:15 ` [PATCH 20/35] m68k: ColdFire V4e MMU context support code gerg
2011-12-23  3:15 ` [PATCH 21/35] m68k: use tracehook_report_syscall_entry/exit for ColdFire MMU ptrace path gerg
2011-12-23  3:15 ` [PATCH 22/35] m68k: modify cache push and clear code for ColdFire with MMU enable gerg
2011-12-23  3:15 ` [PATCH 23/35] m68k: use ColdFire MMU read/write bit flags when ioremapping gerg
2011-12-25 20:23   ` Geert Uytterhoeven
2011-12-23  3:15 ` [PATCH 24/35] m68k: ColdFire V4e MMU paging init code and miss handler gerg
2011-12-23  3:15 ` [PATCH 25/35] m68k: compile appropriate mm arch files for ColdFire MMU support gerg
2011-12-23  3:15 ` [PATCH 26/35] m68k: create ColdFire MMU pgalloc code gerg
2011-12-23  3:15 ` [PATCH 27/35] m68k: use non-MMU entry.S code when compiling for ColdFire CPU gerg
2011-12-23  3:15 ` [PATCH 28/35] m68k: add code to setup a ColdFire 54xx platform when MMU enabled gerg
2011-12-23  3:15 ` [PATCH 29/35] m68k: ColdFire with MMU enabled uses same clocking code as non-MMU gerg
2011-12-25 20:24   ` Geert Uytterhoeven
2011-12-23  3:15 ` [PATCH 30/35] m68k: use non-MMU linker script for ColdFire MMU builds gerg
2011-12-23  3:15 ` [PATCH 31/35] m68k: adjustments to stack frame for ColdFire with MMU enabled gerg
2011-12-23  3:15 ` [PATCH 32/35] m68k: add ColdFire FPU support for the V4e ColdFire CPU's gerg
2011-12-24 19:38   ` Geert Uytterhoeven
2011-12-27 12:36     ` Greg Ungerer
2011-12-28  5:53     ` Greg Ungerer
2011-12-28 10:06       ` Geert Uytterhoeven
2011-12-28 12:32         ` Greg Ungerer
2011-12-28 12:47           ` Andreas Schwab
2011-12-28 11:17       ` Joshua Juran
2011-12-28 12:57         ` Greg Ungerer
2011-12-23  3:15 ` [PATCH 33/35] m68k: do not use m68k startup or interrupt code for " gerg
2011-12-25 20:33   ` Geert Uytterhoeven
2011-12-27 12:24     ` Greg Ungerer
2011-12-27 18:30       ` Geert Uytterhoeven
2011-12-28  0:22         ` Greg Ungerer
2011-12-28 10:09           ` Geert Uytterhoeven
2011-12-29  2:01             ` Greg Ungerer
2011-12-23  3:15 ` [PATCH 34/35] m68k: add ColdFire with MMU enabled support to the m68k mem init code gerg
2011-12-23  3:15 ` [PATCH 35/35] m68k: allow ColdFire 547x and 548x CPUs to be built with MMU enabled gerg
2011-12-26 19:32   ` Geert Uytterhoeven
2011-12-26 19:33     ` Geert Uytterhoeven
2011-12-28  1:35     ` Greg Ungerer
2011-12-29  4:52       ` Greg Ungerer
  -- strict thread matches above, loose matches on Subject: below --
2011-12-16 12:35 [PATCH 00/35 v3] m68k: ColdFire MMU support gerg
2011-12-16 12:36 ` [PATCH 17/35] m68k: define PAGE_OFFSET_RAW for ColdFire CPU with MMU enabled gerg
2011-11-25  3:40 [PATCH 00/35 v2] m68k: ColdFire MMU support gerg
2011-11-25  3:41 ` [PATCH 17/35] m68k: define PAGE_OFFSET_RAW for ColdFire CPU with MMU enabled gerg

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