[GIT] Pull request: u-boot-dfu (26.01.2020)

[Guillermo Rodriguez]

Hi,

El lunes, 27 de enero de 2020, Marek Vasut <marex at denx.de> escribió:

> On 1/27/20 9:14 AM, Guillermo Rodriguez Garcia wrote:
> > Hi Marek,
>
> Hi,
>
> > El lun., 27 ene. 2020 a las 8:52, Lukasz Majewski (<lukma at denx.de>)
> escribió:
> >>
> >> Hi Marek,
> >>
> >>> On 1/26/20 9:26 PM, Lukasz Majewski wrote:
> >>> Hi,
> >>>
> >>> [...]
> >>>
> >>>> ----------------------------------------------------------------
> >>>> Guillermo Rodríguez (1):
> >>>>       dfu: Add option to skip empty pages when flashing UBI images
> >>>> to
> >>>
> >>> Can that option be enabled/disabled at runtime instead of being
> >>> hardcoded?
> >>
> >> It has been designed in a similar way to Android's existing
> >> FASTBOOT_FLASH_NAND_TRIMFFS option.
> >
> > Without this option, UBI images need to be built with --space-fixup
> > [1] so that the kernel can "fix" the NAND on first mount.
> > When this option is used, --space-fixup is no longer necessary because
> > dfu knows how to correctly flash UBI images. However, UBI images built
> > with --space-fixup will still work fine.
>
> Does NAND.TRIMFFS preserve UBI erase counters in the NAND ? I don't
> think so, so I don't think "correctly flash UBI images" is the correct
> formulation here.
>
> Yes, you are right.


> > In other words, enabling this option at buildtime has no countereffects.
> > So there is no point in making it configurable at runtime, if support
> > has been built into U-boot.
> >
> >  [1]: http://www.linux-mtd.infradead.org/faq/ubifs.html#
> L_free_space_fixup
>
> So what if I want to write raw NAND image without "trimffs" on such a
> system via DFU, e.g. a bootloader ? How can I do that ?
>

You mean on a non-ubi partition? Then you don't need to do anything
special. This code is only triggered for ubi partitions.

BR,

Guillermo