(+ Gerd) On Sat, 21 Aug 2021 at 03:10, Devon Bautista <dbauti...@newmexicoconsortium.org> wrote: > > Hello All, > > I am currently working with the Linuxboot developers to improve testing > kernel + initramfs pairs in firmware using OVMF. > > The current maximum image size of an OVMF image is 4MB, which is insufficient > for storing even a minimal and compressed kernel and initramfs. To get around > this, we've been maintaining our own fork of EDK2 that adds 8MiB and 16MiB > OVMF build targets that have enough room in the DXE volume to store a > reasonably-sized kernel and initramfs. However, it would be convenient if > upstream EDK2 supported these larger OVMF targets. > > In discussing this with the previous OVMF maintainer Laszlo Ersek here, it > was brought up that: > > The trend of the ever-growing DXE-phase warrants a larger firmware volume size > 8MiB and 16MiB image sizes seem to be justified because of this QEMU commit > > However, as Laszlo mentioned, introducing a larger volume size is > compatibility breaking, and so seizing the opportunity to come up with a > larger non-volatile variable store layout is necessary. > > That said, I would like to use this thread to discuss among hardware vendors > an optimal variable store layout for these larger image sizes. > > Best, > Devon
> For reference, here is a summary of which sections increased when the 4MiB > build target was added (taken from commit b24fca05) after the previous 2MiB > limit: > > Description Compression type Size [KB] > ------------------------- ----------------- ---------------------- > Non-volatile data storage open-coded binary 128 -> 528 ( +400) > data > Variable store 56 -> 256 ( +200) > Event log 4 -> 4 ( +0) > Working block 4 -> 4 ( +0) > Spare area 64 -> 264 ( +200) > > FVMAIN_COMPACT uncompressed 1712 -> 3360 (+1648) > FV FFS file LZMA compressed > PEIFV uncompressed 896 -> 896 ( +0) > individual PEI uncompressed > modules > DXEFV uncompressed 10240 -> 10240 ( +0) > individual DXE uncompressed > modules > > SECFV uncompressed 208 -> 208 ( +0) > SEC driver > reset vector code > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#79908): https://edk2.groups.io/g/devel/message/79908 Mute This Topic: https://groups.io/mt/85034796/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
