Proposal: U-Boot memory management

[Simon Glass]

Hi Ilias,

On Fri, Dec 22, 2023 at 12:02 PM Ilias Apalodimas
<ilias.apalodimas at linaro.org> wrote:
>
> Hi Simon
>
> I'll respond to the rest more thoroughly but I since I caught this early,
>
> [...]
>
> >
> > 5. Avoid calling efi_allocate_pages() and efi_allocate_pool() outside
> > boot-time services. This solves the problem 6. If memory is needed by
> > an app, allocate it with malloc() and see 3. There are only two
> > efi_allocate_pages() (smbios and efi_runtime). There are more calls of
> > efi_allocate_pool(), but most of these seem easy to fix up. For
> > example, efi_init_event_log() allocates a buffer, but this can be
> > allocated in normal malloc() space or in a bloblist.
>
> The TCG event log is only valid in the EFI world and is described by
> the EFI spec extensions [0]. I prefer it to remain as is

How does that relate to [1] ?

>
> >
> > 6. Don't worry too much about whether EFI will be used for booting.
> > The cost is likely not that great: use bootstage to measure it as is
> > done for driver model. Try to minmise the cost of its tables,
> > particularly for execution time, but otherwise just rely on the
> > ability to disable EFI_LOADER.
> >
> > –
> >
> > Regards,
> > Simon
>
> [0] https://trustedcomputinggroup.org/wp-content/uploads/EFI-Protocol-Specification-rev13-160330final.pdf
> Thanks
> /Ilias

[1] https://trustedfirmware-a.readthedocs.io/en/latest/components/measured_boot/event_log.html