On 06/01/17 at 09:13pm, Maniaxx wrote:
> On 01.06.2017 at 03:57 wrote Dave Young:
> > This means the efi_bgrt_init failed out originally before the early init BGRT
> > patch. Checking the code the only difference is current code we have no
> > below code:
> >
> > status = acpi_get_table("BGRT", 0,
> > (struct acpi_table_header **)&bgrt_tab);
> > if (ACPI_FAILURE(status))
> > return;
> >
> > So probably acpi_get_table has some more sanity checking and it failed
> > early. Can you add a printk before above return to confirm it? Just test
> > the old kernel without early init BGRT patch.
>
> Doesn't fail early. I can see the printk.
Since you do not see /sys/firmware/acpi/bgrt, that means there must be
somewhere failed early so bgrt image sysfs files are not created.
for old kernel arch/x86/platform/efi/efi-bgrt.c copy the bgrt image
then drivers/acpi/bgrt.c will populate the image in sysfs.
Can you do more debugging ie. adding more printk see why bgrt image
sysfs dir is not created?
If we get the reason then we can start to see what we missed in new
code.
Thanks
Dave
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