From: Gary Thomas <gthomas@redhat.com>
To: Chris Morrow <cmorrow@YottaYotta.com>
Cc: ecos-discuss@sourceware.cygnus.com
Subject: RE: [ECOS] 64 bit mips arch, and __DEVTAB__
Date: Wed, 12 Jul 2000 15:24:00 -0000 [thread overview]
Message-ID: <XFMail.20000712162425.gthomas@redhat.com> (raw)
In-Reply-To: <396CEDFD.829746C2@YottaYotta.com>
On 12-Jul-2000 Chris Morrow wrote:
> I'm working on porting eCos to a 64 bit mips cpu and have encountered
> a problem with the DEVTAB_ENTRY macro defined in
> io/common/current/include/devtab.h. It would appear that gcc is aligning
> each piece of data added to the .devtab section on 8 byte boundries.
> This
> causes a space between entries and causes the loop in cyg_io_init() in
> io/commmon/current/iosys.c to fail.
>
> Depending on whether it is legitimate to assume that there is no padding
> for data objects added separately to a section with the section
> __attribute__,
> this may be a compiler issue rather than a eCos issue.
>
One concern [which we may have not thought about] is whether these data will
be properly aligned, even if the sizes match up.
Can you try adding the "aligned()" attribute to the devtab structure and see
what happens?
cyg_devtab_entry_t _l __attribute__ ((section(".devtab"),aligned(1)))
next prev parent reply other threads:[~2000-07-12 15:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-07-12 15:15 Chris Morrow
2000-07-12 15:24 ` Gary Thomas [this message]
2000-07-12 15:52 ` Chris Morrow
2000-07-12 16:50 ` Jonathan Larmour
2000-07-12 17:00 ` Chris Morrow
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