Hi Geert,
On 03/06/11 21:15, Geert Uytterhoeven wrote:
On Fri, Jun 3, 2011 at 08:43,<gerg@xxxxxxxxxxxx> wrote:
From: Greg Ungerer<gerg@xxxxxxxxxxx>
There are 3 families of CPU core types that we support in the m68knommu
architecture branch. They are
. traditional 68000
. CPU32 (which is a 68020 core derivitive without MMU)
derivative ... and without bitfield instructions.
My spelling never was too good :-)
I'll fix up the comment and add mention of bitfields.
. ColdFire
It will be useful going forward to have a CONFIG_ option defined for
each type. We already have one for ColdFire (CONFIG_COLDFIRE), so add
for the other 2 families, CONFIG_M68000 and CONFIG_MCPU32.
I'm wondering whether it would help to have Kconfig symbols for the
instruction capabilities as well.
Then you have to document these capabilities in the kconfig definition only,
and can use single (e.g.) #ifdef CONFIG_CPU_HAS_BITFIELDS tests everywhere
else, instead of duplicating the logic at every #ifdef.
Yes, that sounds like a reasonable idea. I won't add them in this patch
though. I'll add it to the bitops.h merge patch - which is the only
one that would be effected/helped by a bitfield Kconfig option right
now.
Thanks
Greg
Signed-off-by: Greg Ungerer<gerg@xxxxxxxxxxx>
---
áarch/m68k/Kconfig.nommu | á 52 ++++++++++++++++++++++++++++++++++++++++------
á1 files changed, 45 insertions(+), 7 deletions(-)
diff --git a/arch/m68k/Kconfig.nommu b/arch/m68k/Kconfig.nommu
index fc98f9b..b004dc1 100644
--- a/arch/m68k/Kconfig.nommu
+++ b/arch/m68k/Kconfig.nommu
@@ -14,6 +14,33 @@ config GENERIC_CLOCKEVENTS
á á á ábool
á á á ádefault n
+config M68000
+ á á á bool
+ á á á help
+ á á á á The Freescale (was Motorola) 68000 CPU is the first generation of
+ á á á á the well known M68K family of processors. The CPU core as well as
+ á á á á being available as a stand alone CPU was also used in many
+ á á á á System-On-Chip devices (eg 68328, 68302, etc). It does not contain
+ á á á á a paging MMU.
+
+config MCPU32
+ á á á bool
+ á á á help
+ á á á á The Freescale (was then Motorola) CPU32 is a CPU core that is
+ á á á á based on the 68020 processor. For the most part it is used in
without bitfield instructions.
+ á á á á System-On-Chip parts, and does not contain a paging MMU.
Gr{oetje,eeting}s,
á á á á á á á á á á á á Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
á á á á á á á á á á á á á áá áá -- Linus Torvalds
--
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Greg Ungerer -- Principal Engineer EMAIL: gerg@xxxxxxxxxxxx
SnapGear Group, McAfee PHONE: +61 7 3435 2888
8 Gardner Close FAX: +61 7 3217 5323
Milton, QLD, 4064, Australia WEB: http://www.SnapGear.com
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