[U-Boot] [PATCH v6 3/3] GPT: provide commands to selectively rename partitions

Wolfgang Denk
2017-06-18T11:03:57Z

Dear Alison,

In message <CAOuSAjdHerD7iWSwv5HQmx07nALRHschnH5=XToNEZDqA9JsvQ@mail.gmail.com> you wrote:
>
> The idea behind the 'swap' mode is that a storage device can have two sets
> of partitions, one set all named 'primary' and one set all named 'backup'.
> The software updater in userspace can then simply rename the partitions
> with sgdisk in order to pick the new image. The swap mode changes the
> whole set of labels at once, so there's little chance of being interrupted.

It's still a sequential, non-atomic operation, and "little chance"
is exactly the places where Murphy likes to hit you.

> One additional note: the last version I posted worked fine for the sandbox,
> but wouldn't link for an ARM target with the Linaro toolchain, as the
> linker couldn't find atoi(). I guess the libc for the x86 compiler
> includes it. To test on ARM, I copied in simple_atoi() from
> lib/vsprintf.c, but assuredly that is an ugly solution. Does anyone have
> a better idea to solve this problem?

U-Boot should always be self-contained and not link regular library
code from the tool chain.

Best regards,

Wolfgang Denk

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