Hi Alex
-----Original Message----- From: Alexander Graf [mailto:agraf@suse.de] Sent: Monday, January 15, 2018 2:45 PM To: Udit Kumar udit.kumar@nxp.com
Hi Udit,
On 15.01.18 10:09, Udit Kumar wrote:
Hi Alex, Hope you are doing great,
Could you help on UEFI over the u-boot. 1- I couldn't locate EFI_DXE_SERVICES in u-boot, do you have plan to add those
Right now the model is that all device drivers are implemented by U-Boot and that only exposes their interfaces to EFI applications. Implementing DXE in U-Boot would open quite a big can of worms, as it would really only be useful in compilation with PI which is a terrible interface :).
Ok,
2- If I load a driver (with bootefi) which install few protocols, is this ok to do with u-boot
It depends on how much the driver does, but in general yes. Heinrich is currently working on making the iPXE iSCSI driver work, so his EFI payload would expose an EFI block device to yet another payload running after his.
Thanks for this, Heinrich, in this driver, are you accessing underneath hardware register by UEFI-Driver and managing UEFI protocols or you are relying on some h/w access exposed by u-boot driver
3- if you say, 2 is ok then I hope these protocols are kept in some data base, and this new protocol can be opened by an application
Yes, the protocol database is now global and persistent across bootefi invocations.
Thanks
4- if there is some known limitation, like we cannot run DXE_driver etc
What exactly are you trying to do? With the U-Boot UEFI implementation we're trying to find a sweet spot between implementing as much as makes sense, but not the whole UEFI world, as that would just bloat the code needlessly.
I am trying to add a driver (DXE by definition) which a) Access the hardware registers. (I said DXE could due to hardware registers) b) Update memory map as well (AddMemorySpace call) c) Finally it export a protocol, which could be used by its test application.
For b) I am not able to find function call, For a), if I say driver is UEFI and accessing hardware register, will this be acceptable ?
Alex