Hi Stefan,
On 08/04/2017 04:38 PM, Stefan Agner wrote:
From: Stefan Agner <stefan.ag...@toradex.com>
This series adds NXP's Serial Download Protocol (SDP) support via
USB for SPL/U-Boot. It allows to download U-Boot via USB from a
(recovered) SPL using the same tools used to download SPL itself
(specifically imx_usb, but also sb_loader seems to work).
Nice!
The idea has been brought up when the first targets started to make
use of SPL for DDR initialization, see:
https://lists.denx.de/pipermail/u-boot/2015-July/220330.html
There have been lots of discussions surrounding the use of SDP,
and this seems to be a nice alternative to using the i.MX "plugin"
mode that I explored a while back:
https://lists.denx.de/pipermail/u-boot/2017-July/thread.html#298266
The initial SDP implementation (patch 2) requires the payload to
have the imx specific headers (hence the move of the imx header
file in patch 1).
Patch 3 extends image header support beyond the SDP specification,
specifically implements also support for U-Boot headers. This
allows to use the same SPL/U-Boot binaries for recovery as used on
the regular boot device (SD/eMMC). For that to work also the host
side imx_usb tools needed an extension, currently available here:
https://github.com/toradex/imx_loader/tree/imx_usb_batch_mode_refactored
The full patchset allows to download SPL and U-Boot over USB to a
target in recovery mode using the same usb_imx utility:
imx_usb?
The usb_imx utility also has a batch mode which allows to download
multiple artifacts with a single invocation. The details are
outlined in the imx_usb commit message:
https://github.com/toradex/imx_loader/commit/5434415d921f1cc4d22332d9558bed6d42db9f60
In case this patchset gets accepted in U-Boot, I plan to push the
imx_usb changes upstream as well.
Do you have numbers for how much code/data size this adds to SPL?
I believe some i.MX users have struggled to stay within the
size of internal RAM.
Regards,
Eric
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
https://lists.denx.de/listinfo/u-boot
