Hi Heinrich, On Thu, 6 Feb 2025 at 03:56, Heinrich Schuchardt <xypron.g...@gmx.de> wrote: > > On 2/3/25 18:41, Simon Glass wrote: > > The original x86 EFI-app was written back in 2015, about a year before > > the EFI-loader was introduced. At that point, ARM mostly used U-Boot and > > FIT (Flat Image Tree). > > > > Today, sadly, there are a few efforts to re-invent FIT poorly, to cater > > to more primitive boot-environments than U-Boot. One justification for > > this re-invetion has been that EDK2 did not support FIT. > > > > EDK2 does now support FIT but only for the firmware stage. Even then, > > vendors tend to use their own forks, so any new features are slow to > > make it into the market. > > > > EDK2 also supports the ext4 filesystem, but many devices don't include > > that feature, so most distros make use of FAT for storing their boot > > files. Since FAT is not journalled, it is not particularly reliable in > > the face of reset, power failure, etc. > > > > As an interim measure, we can use U-Boot as an EFI app running on top of > > whatever EDK2 fork is in use. This allows use of modern features such as > > FIT and filesystems other than FAT. So far this only supports x86, but > > recent ARM laptops are making use of EFI too. > > > > So this series adds an EFI app for 64-bit ARM. > > > > Note: Since U-Boot does not support EFI's GOP 'blt-only' mode, the > > vidconsole does not operate, but it can still be used, since EDK2 > > handles drawing instead of U-Boot. As a result, the U-Boot logo is not > > shown. > > Thank you Simon for going through this effort to generalize the EFI app.
You're welcome. > > The EFI app should build on all EFI architecture. Will you add RISC-V > support, too? Not in this series, but perhaps later. Regards, Simon
