Hi Heinrich, On Tue, Sep 12, 2017 at 4:18 PM, Heinrich Schuchardt <[email protected]> wrote: > On 09/12/2017 05:00 AM, Bin Meng wrote: >> Hi Heinrich, >> >> On Sun, Sep 10, 2017 at 4:55 PM, Heinrich Schuchardt <[email protected]> >> wrote: >>> Variable EFI_LDS is set based on CONFIG_EFI_STUB_64BIT. >>> It influences which lds script is used for compiling helloworld.efi. >>> This results in building helloworld.efi failing on x86_64 if >>> CONFIG_EFI_STUB_64BIT is not set. CONFIG_EFI_STUB_64BIT is only >>> visible if EFI_STUB is selected. We should be able to compile a 64bit >>> helloworld.efi irrespective of EFI_STUB. >>> >>> With the patch the bitness of the efi build is taken from the >>> architecture choice. >>> >>> Signed-off-by: Heinrich Schuchardt <[email protected]> >>> --- >>> For proper testing >>> https://lists.denx.de/pipermail/u-boot/2017-September/305184.html >>> must be fixed. >>> >>> So I send this as RFC. >> >> Sorry I missed this. This does not go to the U-Boot ML. Did you intend >> to keep the discussion among us? >> > CC: U-Boot Mailing List <[email protected]> > >>> >>> Alex, do you remember why CONFIG_EFI_STUB_64BIT was introduced in the >>> first place. >>> >> >> The CONFIG_EFI_STUB_64BIT was introduced to support booting from a >> 64-bit EFI BIOS. >> >>> Would you ever use a stub with a different bitness than U-Boot? >>> >> >> Yes, for example U-Boot x86 32-bit to boot a 64-bit EFI payload. > > My understanding is that the EFI stub is used if U-Boot is loaded as an > EFI application. >
Maybe there is some confusion. I was referring to the EFI payload as documented in doc/README.efi. Are you referring to the same EFI application in that doc? > It has nothing to do with the EFI application or driver loaded by > U-boot's bootefi command, which I assume you reference as "to boot a > 64-bit EFI payload". > > A stub with different bitness than U-Boot would be needed if we wanted > to load 64 bit U-Boot as a 32 bit EFI application or a 32 bit U-Boot as > a 64 bit EFI application. Is this required in any scenario? > Regards, Bin _______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
