[U-Boot] Uboot as x86_64 EFI payload

Mon Jan 29 15:18:02 UTC 2018

Hi,
I am Juan Alfonso Reyes, a firmware engineer in GMV. Currently we are developing new boards based in Apollo Lake CPU.  We are trying to load uboot from UEFI. Using the default qemu-x86_efi_payload64_defconfig  we are getting "U-Boot EFI Payload 2002 No memory map" error code.
As I can see in the code 2002 means (efi_stub.c):

ret = boot->get_memory_map(&size, NULL, &key, &desc_size, &version);
            if (ret != EFI_BUFFER_TOO_SMALL) {
                        printhex2(BITS_PER_LONG);
                        printhex2(ret);
                        puts(" No memory map\n");
                        while(1);
                        return ret;
            }

0x20   -> BITS_PER_LONG 32bits
0x02 -> EFI_INVALID_PARAMETER

32bits sounds weird for me, so I changed config to use CONFIG_X86_RUN_64BIT instead of CONFIG_X86_RUN_32BIT. I have changed it and I got a compilation error:

In file included from include/common.h:53:0,
                 from cmd/efi.c:8:
cmd/efi.c: In function 'do_efi_mem':
./arch/x86/include/asm/global_data.h:117:12: error: 'global_data_ptr' undeclared (first use in this function)
#define gd global_data_ptr

I have surfed in the code and I have found this in ./arch/x86/include/asm/global_data.h

# if defined(CONFIG_EFI_APP) || CONFIG_IS_ENABLED(X86_64)
/* TODO(sjg at chromium.org<mailto:sjg at chromium.org>): Consider using a fixed register for gd on x86_64 */
#define gd global_data_ptr

What do you mean with "Consider using a fixed register for gd" ?Can you help us to make this work? Are we in the correct direction?

Thank you very much,

Best regards,
________________________________
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Juan Alfonso Reyes Ajenjo
Ingeniero en Informatica / Computer Systems Engineer
Ingeniero en Automática y Electrónica Industrial / Automation and Industrial Electronics Engineer

GMV
Juan de Herrera nº17
Boecillo
E-47151 Valladolid
Tel. +34 983 54 65 54
Fax +34 983 54 65 53
www.gmv.com <http://www.gmv.com/>
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