From: Jerry Van Baren <gerald.vanbaren@smiths-aerospace.com>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] need PPC asm. help. for 83xx watchdog
Date: Fri, 06 Jan 2006 10:36:44 -0500 [thread overview]
Message-ID: <43BE8E8C.3060501@smiths-aerospace.com> (raw)
In-Reply-To: <43BE8B32.1060507@cray.com>
David Updegraff wrote:
> Hi.
>
> Attempting to enable&use watchdog in 8343; but run into Assembler
> (v.2.15) problem in cpu/mpc83xx/start.S:424
> ....
> /* and reset it */
> li r4, 0x556C
> sth r4, SWSRR at l(r3)
> li r4, 0xAA39 <-------- gas barks here, 0xAA39 > 0x8000
> sth r4, SWSRR at l(r3)
>
> which I do not understand, since I thought 'li' was an UNsigned 16bit
> load. I can work around it in a kludgey way with.
>
> lis r4, 0
> ori r4, r4, 0xAA39
> sth r4, SWSRR at l(r3)
>
> but wonder if one you PowerPC assembler gurus could offer better suggestion.
>
> Thanx.
>
> -dbu.
"li" is a simplified mnemonic which is actually "addi" (which
sign-extends the immediate value) according to the "PowerPC
Microprocessor Family: The Programming Environments" Appendix F (p. F-15).
Why gas barks, I'm not quite sure. Probably because it suspects you
wanted it unsigned (which actually is the case - I hate it when tools
are smarter than me).
gvb
next prev parent reply other threads:[~2006-01-06 15:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-06 15:22 [U-Boot-Users] need PPC asm. help. for 83xx watchdog David Updegraff
2006-01-06 15:36 ` Jerry Van Baren [this message]
2006-01-07 11:03 ` Pantelis Antoniou
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