mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Giorgio Dal Molin <giorgio.nicole@arcor.de>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>, barebox@lists.infradead.org
Subject: Re: barebox image for an spi flash (like m25p0) on an imx7 soc
Date: Thu, 5 Mar 2020 10:50:15 +0100 (CET)	[thread overview]
Message-ID: <1062353935.2358.1583401816499@mail.vodafone.de> (raw)
In-Reply-To: <4b929efa-4d1b-5641-743d-96d94766c57d@pengutronix.de>

Hi,

thank you for the quick reply.

here is how I register the bbu for the spi flash:

imx7_bbu_internal_spi_i2c_register_handler("SPI", "/dev/m25p0", BBU_HANDLER_FLAG_DEFAULT);

and here is a hex dump of the spi flash after bb-updating (I hacked the 'cat' command a bit):

imx7d: / cat -h -b 0x450 /dev/m25p0
0000: 0xfe 0x03 0x00 0xea 0xfe 0xff 0xff 0xea 0xfe 0xff 0xff 0xea 0xfe 0xff 0xff 0xea 
0010: 0xfe 0xff 0xff 0xea 0xfe 0xff 0xff 0xea 0xfe 0xff 0xff 0xea 0xfe 0xff 0xff 0xea 
0020: 0x62 0x61 0x72 0x65 0x62 0x6f 0x78 0x00 0x00 0x00 0x00 0x00 0x00 0xf0 0x06 0x00 
0030: 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 
0040: 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 0x55 
0050: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
... < zeros > ...
03f0: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0400: 0xd1 0x00 0x20 0x40 0x00 0x10 0x00 0x80 0x00 0x00 0x00 0x00 0x2c 0x04 0x00 0x80 
0410: 0x20 0x04 0x00 0x80 0x00 0x04 0x00 0x80 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0420: 0x00 0x00 0x00 0x80 0x00 0xf0 0x06 0x00 0x00 0x00 0x00 0x00 0xd2 0x01 0xbc 0x40 
0430: 0xcc 0x01 0x6c 0x04 0x30 0x34 0x00 0x04 0x0f 0x40 0x00 0x05 0x30 0x39 0x10 0x00 
0440: 0x00 0x00 0x00 0x02 0x30 0x7a 0x00 0x00 0x01 0x04 0x00 0x01 0x30 0x7a 0x01 0xa0 

It seems 'reasonable': there's a 0x400 bytes flash header and then the actual image
starts, but it does not boot.

The following dump is a booting u-boot image, flashed from barebox with the commands:

imx7d: tftp ub.bin
imx7d: erase /dev/m25p0
imx7d: cp ub.bin /dev/m25p0
imx7d: / cat -h -b 0x450 /dev/m25p0
0000: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0010: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x02 
0020: 0x03 0x00 0x00 0x00 0x03 0x00 0x00 0x00 0x00 0x00 0x00 0x02 0x00 0x00 0x00 0x00 
0030: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0040: 0x02 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0050: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0060: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x3b 0x04 0x18 0x08 0x08 0x0d 0x04 0x1d 
0070: 0x00 0x24 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0080: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
... < zeros > ...
0150: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0160: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x01 0x00 0x00 0x01 0x00 0x00 0x00 0x00 
0170: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0180: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0190: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
01a0: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
01b0: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
01c0: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
01d0: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
01e0: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
01f0: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x01 0xee 0xff 0xc0 
0200: 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 
... < ffs > ...
03f0: 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 0xff 
0400: 0xd1 0x00 0x20 0x40 0x00 0x10 0x91 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0410: 0x20 0x04 0x91 0x00 0x00 0x04 0x91 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0420: 0x00 0x00 0x91 0x00 0x00 0xa0 0x00 0x00 0x00 0x00 0x00 0x00 0xd2 0x00 0x04 0x40 
0430: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
0440: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 


The first 4 bites at offset 0x400 are the same but then the u-boot working image is
different.

ub: 0400: 0xd1 0x00 0x20 0x40 0x00 0x10 0x91 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
bb: 0400: 0xd1 0x00 0x20 0x40 0x00 0x10 0x00 0x80 0x00 0x00 0x00 0x00 0x2c 0x04 0x00 0x80 

Digging a bit in the IMX7DRM.pdf I found the table at 6.6.6.3 'QuadSPI configuration parameters':
the table seems SPI-specific so it should be generated only in the special case of an SPI
barebox image.

giorgio

> On March 5, 2020 at 10:05 AM Ahmad Fatoum <a.fatoum@pengutronix.de> wrote:
> 
> 
> On 3/5/20 9:26 AM, Giorgio Dal Molin wrote:
> > Hi,
> > 
> > does barebox support generating a bootloader image that's able to boot
> > from an spi nor flash (m25p0) on an imx7 soc ?
> > 
> > I'm currently able to read/write/erase the flash and I can also 'barebox_update'
> > the image on the flash but the imx7 does not want to boot from it.
> > 
> > After comparing a working u-boot image with what 'barebox_update' flashes I think
> > the problem is the barebox image does not have the proper binary layout.
> > 
> > Is this use case already implemented or is it still a TODO ?
> 
> At what offset is the barebox partition you apply the barebox update to?
> If the barebox partition offset is not at the very start, try setting offset
> to zero.
> 
> Not sure about the i.MX7 specifically, but for other i.MX*, the image already
> contains padding at the start, so it can directly be written to the medium, unlike
> U-Boot, which needs to be written at an offset.
> 
> Cheers
> Ahmad
> 
> > 
> > thank you,
> > giorgio
> > 
> > _______________________________________________
> > barebox mailing list
> > barebox@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/barebox
> > 
> 
> 
> -- 
> Pengutronix e.K.                           |                             |
> Steuerwalder Str. 21                       | https://www.pengutronix.de/ |
> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
> 
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

  reply	other threads:[~2020-03-05  9:50 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-05  8:26 Giorgio Dal Molin
2020-03-05  9:05 ` Ahmad Fatoum
2020-03-05  9:50   ` Giorgio Dal Molin [this message]
2020-03-05 13:24     ` Sascha Hauer
2020-03-05 13:54       ` Giorgio Dal Molin
2020-03-05 14:20         ` Rouven Czerwinski
2020-03-05 17:11           ` Giorgio
2020-03-06  8:41             ` Giorgio Dal Molin
2020-03-06 13:01               ` Sascha Hauer
2020-03-06 13:46                 ` Giorgio Dal Molin
2020-03-06 17:22                 ` Giorgio Dal Molin
2020-03-06 10:11     ` Giorgio Dal Molin
2020-03-06 12:59       ` Sascha Hauer
2020-03-06 14:08         ` Giorgio Dal Molin

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=1062353935.2358.1583401816499@mail.vodafone.de \
    --to=giorgio.nicole@arcor.de \
    --cc=a.fatoum@pengutronix.de \
    --cc=barebox@lists.infradead.org \
    /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