While revisiting problem discussed
http://sourceforge.net/p/edk2/mailman/message/32171128/ I tried to
understand why using EXCLUSIVE as suggested in this thread did not
work. I added print of EFI status code from protocol open and to my
surprise it was 3 (UNSUPPORTED). This happens in this code:
handles = grub_efi_locate_handle (GRUB_EFI_BY_PROTOCOL, &net_io_guid,
0, &num_handles);
if (! handles)
return;
for (handle = handles; num_handles--; handle++)
{
grub_efi_simple_network_t *net;
struct grub_net_card *card;
net = grub_efi_open_protocol (*handle, &net_io_guid,
GRUB_EFI_OPEN_PROTOCOL_BY_EXCLUSIVE);
if (! net)
/* This should not happen... Why? */
continue;
The problem is, original grub2 code is using
GRUB_EFI_OPEN_PROTOCOL_GET_PROTOCOL here and works. I do not understand
how it can return UNSUPPORTED, when we just located handles that claim
support simple network protocol. And if it fails with EXCLUSIVE, why it
works wit GET_PROTOCOL?
What is more puzzling, when called later the same open succeeds.
I probably miss something obvious here; any hints appreciated.
I'm using 64 bit OVMF at commit SVN 16106; qemu is called as
qemu-system-x86_64 -bios /usr/share/qemu/ovmf-x86_64.bin -net nic,model=virtio
-net user,tftp=/tmp/tftpboot,bootfile=/boot/grub/x86_64-efi/core.efi
Thank you!
-andrei
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