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Groups > comp.sys.acorn.programmer > #1649
| From | Martin Wuerthner <spamtrap@mw-software.com> |
|---|---|
| Newsgroups | comp.sys.acorn.programmer |
| Subject | Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) |
| Date | 2012-04-19 21:24 +0200 |
| Organization | MW Software |
| Message-ID | <5f6c018352.martin@bach.planiverse.com> (permalink) |
| References | <ant191232d07pErr@client.cjemicros.co.uk> <d8a3df8252.martin@blueyonder.co.uk> <ant19150372bpErr@client.cjemicros.co.uk> <mpro.m2qpgu015g74w01k8.news@stevefryatt.org.uk> |
In message <mpro.m2qpgu015g74w01k8.news@stevefryatt.org.uk>
Steve Fryatt <news@stevefryatt.org.uk> wrote:
> On 19 Apr, Chris Evans wrote in message
> <ant19150372bpErr@client.cjemicros.co.uk>:
>> p.s. I was told how to patch !Prophet for the BeagleBoard (Can't find the
>> details at present) IIRC it involved removing a ^ from towards the end of
>> a load or store assembler instruction. Is that to do with unaligned memory
>> access.
> Either you or your informant is confused, as the ^ was used to preserve
> flags on multiple loads and stores. It stopped working on the Iyonix, so
> what you're describing above would have been done to make Prophet 32-bit
> friendly. Beagleboard compatibility involves removing unaligned loads and
> stores, which is something completely different.
Correct in principle, but I have seen cases similar to the one
described by Chris in practice. This happens because some of the
supposedly 32-bit-unsafe instructions continued to work happily on the
Iyonix, so programmers could get away with missing some of them.
The switch to the BeagleBoard finally uncovers 32-bit conversion
glitches that went unnoticed before, and therefore, it can happen that
"^" or "S" modifiers have to be removed from instructions to make a
program that works fine on the Iyonix work on the BeagleBoard as well.
--
Martin
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Martin Wuerthner MW Software http://www.mw-software.com/
RISC OS Software for Design, Printing and Publishing
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ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Chris Evans <chris@cjemicros.co.uk> - 2012-04-19 13:05 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Martin Bazley <martin.bazley@blueyonder.co.uk> - 2012-04-19 14:15 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Chris Evans <chris@cjemicros.co.uk> - 2012-04-19 16:10 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-04-19 18:41 +0200
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Steve Fryatt <news@stevefryatt.org.uk> - 2012-04-19 19:46 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Martin Wuerthner <spamtrap@mw-software.com> - 2012-04-19 21:24 +0200
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-04-19 18:32 +0200
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) chrisbazley@bigfoot.com - 2012-04-29 06:37 -0700
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Martin Bazley <martin.bazley@blueyonder.co.uk> - 2012-04-29 15:47 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Gerph <gerph@gerph.org> - 2012-04-29 07:39 -0700
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) druck <news@druck.org.uk> - 2012-04-29 19:30 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-04-30 06:16 +0200
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) druck <news@druck.org.uk> - 2012-04-30 22:47 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Gerph <gerph@gerph.org> - 2012-04-30 15:30 -0700
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-02 19:26 +0200
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Gavin Wraith <gavin@wra1th.plus.com> - 2012-05-02 21:02 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) druck <news@druck.org.uk> - 2012-05-02 22:33 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) cferris@freeRemoveuk.com.invalid - 2012-05-02 23:37 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-03 06:25 +0200
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) trevj <trevj@cwazy.co.uk> - 2012-05-03 13:01 -0700
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-04 06:30 +0200
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Martin Wuerthner <spamtrap@mw-software.com> - 2012-05-04 11:55 +0200
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Matthew Phillips <spam2011m@yahoo.co.uk> - 2012-05-04 22:39 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-05 17:58 +0200
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Theo Markettos <theom+news@chiark.greenend.org.uk> - 2012-05-05 17:22 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Simon <simon.willcocks@t-online.de> - 2012-05-04 04:24 -0700
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Theo Markettos <theom+news@chiark.greenend.org.uk> - 2012-05-01 21:33 +0100
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Gerph <gerph@gerph.org> - 2012-05-01 17:06 -0700
Re: ARMv5, ARMv6 & ARMv7 (Programs for the Raspberry Pi) Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-02 19:02 +0200
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