[PATCH 3/3] env: Add single to redundant environment upgrade path

[Tom Rini]

On Fri, Dec 19, 2025 at 12:09:28AM +0100, Marek Vasut wrote:
> On 12/18/25 2:58 PM, Tom Rini wrote:
> > On Wed, Dec 17, 2025 at 11:58:15PM +0100, Marek Vasut wrote:
> > > On 12/17/25 9:56 PM, Tom Rini wrote:
> > > > On Wed, Dec 17, 2025 at 09:12:33PM +0100, Marek Vasut wrote:
> > > > 
> > > > > Add support for converting single-copy environment to redundant environment.
> > > > > In case CRC checks on both redundant environment copies fail, try one more
> > > > > CRC check on the primary environment copy and treat it as single environment.
> > > > > If that check does pass, rewrite the single-copy environment into redundant
> > > > > environment format, indicate the environment is valid, and import that as
> > > > > usual primary copy of redundant environment. Follow up 'env save' will then
> > > > > store two environment copies and the system will continue to operate as
> > > > > regular redundant environment system.
> > > > > 
> > > > > Add test which validates this upgrade path. The test starts with spi.bin
> > > > > which is pre-populated as single-copy environment and then upgrades that
> > > > > environment to dual-copy environment.
> > > > > 
> > > > > Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
> > > > > ---
> > > > > Cc: Heinrich Schuchardt <xypron.glpk at gmx.de>
> > > > > Cc: Jerome Forissier <jerome.forissier at linaro.org>
> > > > > Cc: Simon Glass <sjg at chromium.org>
> > > > > Cc: Tom Rini <trini at konsulko.com>
> > > > > Cc: u-boot at lists.denx.de
> > > > 
> > > > For merging, a cover letter makes things so much easier, please add one
> > > > for v2. And, I think this needs a Kconfig option. I'm sure you added
> > > > this because someone has a valid use case but it's going to grow too
> > > > many platforms where that feature isn't likely desired. Thanks.
> > > Do you actually observe growth ? Because this is calling existing functions,
> > > so the growth has to be in units of bytes tops.
> > 
> > A good question, I was assuming so but checking xilinx_versal_virt (a
> > platform with redundant env) shows yes, it does:
> > 01: Merge patch series "fit: print conf node compatibles + use property string constants"
> > 05: env: Add single to redundant environment upgrade path
> >     aarch64: (for 1/1 boards) all +96.0 text +96.0
> >              xilinx_versal_virt: all +96 text +96
> >                 u-boot: add: 0/0, grow: 1/0 bytes: 84/0 (84)
> >                   function                                   old     new   delta
> >                   env_check_redund                           316     400     +84
> Correct, and the growth is minimal and gated by ENV_REDUND already.
> 
> I think it would still be good not to confuse users with too many additional
> Kconfig symbols, but if you insist, I will add one ?

Yes, please add one, it's 188 platforms that'll grow and I do think
migration from single to redundant env is a niche use case. Thanks.

-- 
Tom
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