Debugging Lenovo Ideapad Miix 310
Opening thread on debugging uefi pxe issues on this device… latest test 05_ipxe:
Ok, seems like this piece is another one with cranky firmware on it. The
ROM sizeyou see printed on screen is way too large to be a proper PCI expansion ROM image. The Linux kernel actually tries to allocate this much memory for the expansion ROM(s) in that very early startup and hits the wall. From the figures it looks like - and we have seen the same on that HP x2 210 tablet - ROM size is rather being initialized with some weird pointer instead of the actual size (unsigned integer).
So let’s try something just for the fun of it.
06_bzImage(the later without skipping - just in case you’re missing the download link) dereferences the ROM size “pointer”. I have a feeling that this might horribly fail but let’s give it a go.
As well I added
07_bzImagethat does not do much printing but only skips the PCI ROM initialization stuff. I have a feeling that maybe the printout might be causing the later hang.
And then there is another heavy debug build in
08_bzImage. So hopefully we’ll see where exactly in exit_boot it does hang.
@sebastian-roth as predicted 01_bzImage hangs on Early in __setup_efi_pci64… 1 2 3 4 5
testing 02_bzImage now…
@Lee-Rowlett I followed the video closely many times but I am still not exactly sure what’s going on. It kind of seems like we had the same hang as we saw on the HP x2 210. But using the fixed kernel I provided you were still not able to boot. So maybe there is another issue beside the PCI initialization.
So we need to start the kernel debugging from scratch again. Please try
01_bzimageas you have done with the other two kernel images as well. Use the normal/non-debug
ipxe.efiand set the host’s kernel parameter to
debug earlyprintk=efi loglevel=7. Schedule a job, boot it up and see what you get.
Early in __setup_efi_pci64… 1 2 3 4 5.
If yes, try
02_bzImagewhich does essentially the same thing but should also print the PCI ROM information that causes the lockup. Take a picture of the screen and post here.
03_bzImagewhich should fix the bug on PCI setup. Take a picture if you still see a hang. With that kernel image.
@sebastian-roth Oh dear, so bad memories… good luck for resolution !
Lee is telling me that he sees the
Early in __setup_efi_pci64… 1 2 3 4 5debug output that we had with the HP book as well.
Have been onto this with Lee for a bit already. First we thought this might be the same issue that we see with the Lenovo Miix 320 (see here). But turns out it’s not. So this is where I asked him to start a new thread and post things here.
@wayne-workman forum is deciding to fight with me… lol, added link to higher res
@lee-rowlett I think the photo is too low-res to be of much use.
I know while its a different thread, there is an 07 that are being tested on the dells.https://forums.fogproject.org/topic/11034/uefi-pxe-on-dell-optiplex-7010-hangs/30
The request is to have a super clear video to record the messages, something my iphone 5 is challenged to do.
Nevermind, you are farther along in the booting process than the Dell 7010s You are in the FOS kernel at this point.
Lenovo IdeaPad Miix 310 - 05_ipxe.efi