From: Tom Rini <trini@konsulko.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] AM335x SPI boot not working
Date: Thu, 14 Jan 2016 16:01:00 -0500 [thread overview]
Message-ID: <20160114210100.GY3359@bill-the-cat> (raw)
In-Reply-To: <1578508.0Ss7qeH1tP@lem-wkst-02>
On Wed, Dec 16, 2015 at 03:34:24PM +0100, Lars Poeschel wrote:
> Hi!
>
> I played a bit with spi boot on my am3359. It is currently not working with u-
> boot at least with the machine I work here. Has anyone else problems with spi
> boot on am335x ?
>
> On boot SPL reads a value from a processor register to determine from which
> device it was booting and it uses that value to continue booting process from
> that same device.
> I found, that in my case the processor register contained a 0x0b and SPL could
> not match that to a hardware device. BOOT_DEVICE_SPI is defined as 0x15 in
> arch/arm/include/asm/arch-am33xx/spl.h. SPL does not find a mathch for 0x0b,
> decides this is an unknown value and stalls. So far so good.
>
> I looked up in the technical reference manual if the value 0x15 is correct. I
> had TRM rev. F on my harddrive and found the value in 26.1.10.2, on page 4295
> and it is indeed 0x15 as in u-boot.
> I looked on TI website for a new version of the TRM and they currently have
> rev. L. There I found in 26.1.10.2 on page 4960 that SPI boot has 0x0b!
>
> My question is now how to best cope with this issue and if anybody has more
> information on what happend.
> I don't know if they only made a mistake in the TRM and fixed that or if they
> have new silicone revisions that really have another boot device value for spi
> boot.
> What can we do ?
Sorry for the late reply. It sounds like at some point post PG2.1 TI
changed at least the value used for SPI boot. I have in the past
validated SPI boot on my AM335x GP EVM with PG2.1 silicon. SPI boot on
this hardware is not supported officially due to I believe hardware
design issues. Did you make any further progress here? Did making the
value U-Boot checks by 0x0b make things suddenly work? Thanks!
--
Tom
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 836 bytes
Desc: Digital signature
URL: <http://lists.denx.de/pipermail/u-boot/attachments/20160114/cd5a753b/attachment.sig>
next prev parent reply other threads:[~2016-01-14 21:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-16 14:34 [U-Boot] AM335x SPI boot not working Lars Poeschel
2016-01-14 21:01 ` Tom Rini [this message]
2016-01-18 9:02 ` Lars Poeschel
2016-01-19 16:01 ` Tom Rini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160114210100.GY3359@bill-the-cat \
--to=trini@konsulko.com \
--cc=u-boot@lists.denx.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox