Hello Leif,
iPXE uses the EFI simple network protocol to execute DHCP.
Can GRUB already do the same when the EFI_PXE_BASE_CODE_PROTOCOL is not present?
What I do not understand about GRUB's grub_net_configure_by_dhcp_ack() is that it silently assumes IPv4 being used without even checking. This contradicts the definition of the PXE base code protocol in the UEFI standard:
EFI_PXE_BASE_CODE_PACKET DhcpAck is a union:
typedef union { UINT8 Raw[1472]; EFI_PXE_BASE_CODE_DHCPV4_PACKET Dhcpv4; EFI_PXE_BASE_CODE_DHCPV6_PACKET Dhcpv6; } EFI_PXE_BASE_CODE_PACKET;
Should the check be done in grub_efi_net_config_real()?
Best regards
Heinrich
On 8/5/19 10:08 PM, Heinrich Schuchardt wrote:
Hello Alex,
lib/efi_loader/efi_net.c contains pieces of the EFI_PXE_BASE_CODE_PROTOCOL. But it is incompletely implemented: all function pointers are NULL and so immediate failure is expected when using the protocol.
Do you remember why you introduced this protocol into U-Boot? It is not part of the EBBR specification.
It is not needed for booting via GRUB from disk but seems to be used to configure the network device in GRUB (grub_net_configure_by_dhcp_ack() seems only to consume pxe_mode->dhcp_ack).
If the UEFI subsystem is initialized before using the 'dhcp' command the DHCP results are ignored.
@Patrick: What do you use the protocol for? GRUB?
Best regards
Heinrich