From: "Barbier, Renaud" <renaud.barbier@abaco.com>
To: Lucas Stach <l.stach@pengutronix.de>,
"barebox@lists.infradead.org" <barebox@lists.infradead.org>
Subject: RE: cortex-a9 boot issue
Date: Thu, 2 May 2019 13:16:18 +0000 [thread overview]
Message-ID: <BN8PR16MB273864A412B5A00FA6A0AED191340@BN8PR16MB2738.namprd16.prod.outlook.com> (raw)
In-Reply-To: <1556792512.2590.5.camel@pengutronix.de>
Thanks.
At present, not calling this hyp_install function seems to be ok
Should I have used a pre-bootloader?
What is the barebox/ARM way I should have followed? I come from PPC and not familiar yet with the PBL.
> -----Original Message-----
> From: Lucas Stach [mailto:l.stach@pengutronix.de]
> Sent: 02 May 2019 11:22
> To: Barbier, Renaud <renaud.barbier@abaco.com>;
> barebox@lists.infradead.org
> Subject: Re: cortex-a9 boot issue
>
>
>
> [EXTERNAL SOURCE]: This email originated from outside Abaco. DO NOT CLICK
> a link or open an attachment unless you know the content is safe and are
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>
> Hi Renaud,
>
> Am Mittwoch, den 01.05.2019, 10:32 +0000 schrieb Barbier, Renaud:
> > I have added support for a cortex-a9 off the master branch.
> >
> > I am seeing an issue to boot to the prompt found in the function
> > hyp_install. The assembly code is as follows:
> > mrs r12, cpsr
> > and r12, r12, #MODE_MASK
> >
> > @ Save the initial CPU state
> > adr r0, .L__boot_cpu_mode_offset
> > ldr r1, [r0]
> > str r12, [r0, r1] ===> I get an exception here because
> > the register r12 is being written to [r0 + r1] which points to the
> > SPI NOR boot flash.
> >
> > Commenting out the call to all functions calling hyp_install, barebox
> > does get to the prompt.
> >
> > Is there something I could be missing that would put the
> > __boot_cpu_mode variable in a writable area?
>
> No, this code was just not written with XIP in mind and I'm currently
> no sure how to improve this, given how early this code needs to be
> executed.
>
> Regards,
> Lucas
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prev parent reply other threads:[~2019-05-02 13:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-01 10:32 Barbier, Renaud
2019-05-02 10:21 ` Lucas Stach
2019-05-02 13:16 ` Barbier, Renaud [this message]
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