From: Rouven Czerwinski <r.czerwinski@pengutronix.de>
To: "Yazdani, Reyhaneh" <RYazdani@data-modul.com>
Cc: "barebox@lists.infradead.org" <barebox@lists.infradead.org>
Subject: Re: load BL31 on imx8mm and imx8mq
Date: Wed, 26 Jun 2019 11:28:18 +0200 [thread overview]
Message-ID: <c1496d83a1ba4d4a61d69bf04abe4c6965a235a3.camel@pengutronix.de> (raw)
In-Reply-To: <24b0cc8b-93b2-ccf8-9b9d-1d618584958e@data-modul.com>
On Wed, 2019-06-26 at 08:46 +0000, Yazdani, Reyhaneh wrote:
> Hello everyone,
>
>
> On the process of bring-up imx8mm board, I am at the point that load
> bl31 and
> jump to ATF.Upon exit from ATF's initialization routine, the
> execution level
> should be EL2.
>
> My question is about imx8mq_atf_load_bl31 function.
> After copy BL31 into OCRAM address, the function sets up the sp_el2
> to
> "MX8MQ_ATF_BL33_BASE_ADDR - 16".
>
> Can anyone explain me why this address? Because I am using the same
> address for
> imx8mm and it seems Barebox does not return to this point.
sp_el2 is the address for the stack pointer in el2. This is done so
there is a stack pointer setup after returning from TF-A.
The TF-A return address is compiled into the TF-A and may be different
for the imx8mm. Looking into the TF-A PLAT_NS_IMAGE_OFFSET is set to
0x40200000. So execution should continue after TF-A at this address.
Regards,
Rouven Czerwinski
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next prev parent reply other threads:[~2019-06-26 9:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-26 8:46 Yazdani, Reyhaneh
2019-06-26 9:28 ` Rouven Czerwinski [this message]
2019-06-26 9:51 ` AW: " Yazdani, Reyhaneh
2019-06-26 10:25 ` Rouven Czerwinski
2019-06-26 13:12 ` Yazdani, Reyhaneh
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