[systemd-devel] bootloader time on a non-EFI bootloader

[Koen Kooi]

> Op 9 apr. 2015, om 11:28 heeft Lennart Poettering <lennart at poettering.net> het volgende geschreven:
> 
> On Mon, 16.03.15 11:29, Umut Tezduyar Lindskog (umut at tezduyar.com) wrote:
> 
>> Hi,
>> 
>> I would like to pass the time it was spent in bootloader to systemd.
>> Is there a kernel command line to pass this information on non EFI
>> bootloader? Or is there an another way?
> 
> I am open to add this, but I really don't want to see tons of
> different "drivers" to read this data added to systemd. Hence the way
> I think this should work, is adding a generic interface to the kernel
> to /sys/firmware/timing or so, where this information can be read
> from. We'd then make systemd read that. And wherever the information
> comes from would be a kernel internal decision, and could be
> implemented in a myriad of different ways for different architectures.
> 
> Also note that ACPI 5.0 exports this timing information in a generic
> way anyway. Given that ACPI is fairly standard and apparently is even
> what embedded is standardizing on I'd be open to adding native support
> for parsing this info from ACPI to systemd, if it's easy enough.

My situation is slightly different: UEFI that loads a linux Image directly using the EFI stub, but no ACPI since it’s a devicetree platform. What kind of options to I have to get the boottime info?
Long term I’d like to use gummiboot, but I haven’t tried building it for aarch64 yet.

regards,

Koen