[U-Boot] [PATCH 4/9] efi_loader: Add boot time services

[Alexander Graf]

On 26.12.15 19:09, Leif Lindholm wrote:
> On Tue, Dec 22, 2015 at 02:57:51PM +0100, Alexander Graf wrote:

[...]

>> +		break;
>> +	case 2:
>> +		/* Exact address, grant it. The addr is already in *memory. */
> 
> As far as I can tell, this is why GRUB works. Because it filters
> through the memory map manually, requesting to allocate its heap at an
> exact address in a region of free memory in the UEFI memory map.
> 
> The key is that EFI_LOADER_MEMORY will be used by applications loaded
> as well as by U-Boot to load applications into. A simple example where
> this could be problematic would be a large(ish) initrd loaded via initrd=
> on kernel (stub loader) command line rather than via GRUB.

Thinking about this once more, we don't expose any file system
interfaces to EFI applications, so initrd= won't work anyway. That means
the only viable path to go right now is via grub which means we
shouldn't get into memory contention with 128MB LOADER_DATA.


Alex