Am 29.09.2016 um 05:37 schrieb Bin Meng bmeng.cn@gmail.com:
Hi Simon,
On Wed, Sep 28, 2016 at 10:43 PM, Simon Glass sjg@chromium.org wrote: Hi Bin,
On 27 September 2016 at 19:23, Bin Meng bmeng.cn@gmail.com wrote: Hi Simon,
On Wed, Sep 28, 2016 at 1:55 AM, Simon Glass sjg@chromium.org wrote: Hi Bin,
On 26 September 2016 at 20:44, Bin Meng bmeng.cn@gmail.com wrote: Hi Simon,
On Tue, Sep 27, 2016 at 8:35 AM, Simon Glass sjg@chromium.org wrote: Hi Bin,
> On 26 September 2016 at 02:50, Bin Meng bmeng.cn@gmail.com wrote: > Hi Simon, > >> On Mon, Sep 26, 2016 at 5:27 AM, Simon Glass sjg@chromium.org wrote: >> At present we use a CONFIG option in efi.h to determine whether we are >> building the EFI stub or not. This means that the same header cannot be >> used for EFI_LOADER support. The CONFIG option will be enabled for the >> whole build, even when not building the stub. >> >> Use a different define instead, set up just for the files that make up the >> stub. >> >> Signed-off-by: Simon Glass sjg@chromium.org >> --- >> >> Changes in v2: >> - Add new patch to tidy up selection of building the EFI stub >> >> include/efi.h | 7 +++++-- >> lib/efi/Makefile | 4 ++-- >> 2 files changed, 7 insertions(+), 4 deletions(-) >> >> diff --git a/include/efi.h b/include/efi.h >> index d07187c..3d58780 100644 >> --- a/include/efi.h >> +++ b/include/efi.h >> @@ -30,8 +30,11 @@ struct efi_device_path; >> >> #define EFI_BITS_PER_LONG BITS_PER_LONG >> >> -/* With 64-bit EFI stub, EFI_BITS_PER_LONG has to be 64 */ >> -#ifdef CONFIG_EFI_STUB_64BIT >> +/* >> + * With 64-bit EFI stub, EFI_BITS_PER_LONG has to be 64. EFI_STUB is set >> + * in lib/efi/Makefile, when building the stub. >> + */ >> +#if defined(CONFIG_EFI_STUB_64BIT) && defined(EFI_STUB) > > I don't understand why this is needed?
If building the 64-bit EFI stub, we need to use 64-bit ints for the stub, but 32-bits for the rest of U-Boot. So this header gets used both ways.
For 32-bit EFI stub or U-Boot itself, EFI_BITS_PER_LONG is defined as BITS_PER_LONG which is 32.
Yes that's right. But in the case of the stub, it can be different from U-Boot itself. This case takes care of that.
Sorry but I still don't get it. What's broken without this change?
When building U-Boot with CONFIG_EFI_STUB_64BIT enabled, at present EFI_BITS_PER_LONG will be 64.
This is fine for building the stub.
Yes
But for building U-Boot, we still want it to be 32.
Yes
At present the code overrides EFI_BITS_PER_LONG, setting it to 64 if CONFIG_EFI_STUB_64BIT is enabled.
This means that EFI_LOADER support does not build properly, since it uses 64 instead of 32.
So you want CONFIG_EFI_STUB_64BIT and CONFIG_EFI_LOADER both be defined? I don't think it is a valid configuration.
Why not?
Alex