From owner-freebsd-arm@FreeBSD.ORG  Tue May  1 16:55:10 2012
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From: Ian Lepore <freebsd@damnhippie.dyndns.org>
To: Warner Losh <imp@bsdimp.com>
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Date: Tue, 01 May 2012 10:55:00 -0600
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Cc: arm@freebsd.org, Tim Kientzle <tim@kientzle.com>
Subject: Re: Request for Review:  improving Ubldr syscall linkage.
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On Tue, 2012-05-01 at 10:23 -0600, Warner Losh wrote:
> On May 1, 2012, at 2:01 AM, Damjan Marion wrote:
> 
> > 
> > On May 1, 2012, at 7:43 AM, Tim Kientzle wrote:
> >> 
> >> The only odd point:  The ARM reference I have lists blx
> >> only for ARMv6 and ARMv7 instruction sets … or am I
> >> misreading that somehow?
> > 
> > BX and BLX are supported since ARMv5 in ARM mode and since ARMv4 in THUMB mode so this will break some very old stuff like StrongARM which is ARMv4(non T).
> 
> Of the Atmel stuff, only the AT91RM9200 is ARM v4.  The rest is ARMv5.  I don't know that we support the callback to the bootloader for the Atmel port, but a lot of work went in for the AT91SAM stuff that might have snuck that kind of change in when I wasn't looking.
> 
> Warner

The rm9200 is ARMv4T so according to the ARM ARM it should be okay with
the BX and BLX instructions.

-- Ian