So I dug a little further ( out of some morbid interest ) and found / did the following,
( pulled the latest into a kernel src tree I had laying around from Linus's git branch ) then did the following export ARCH=arm && make mrproper export ARCH=arm && make menuconfig Im on a laptop ( x86 ) to explain the exports, After looking at the BCM2711xxxx thats on the Pi 4, I enabled the BCM2835 inside the Broadcom SOC's list as the Pi4 bits seem to be added to this one. Now there is Broadcom BCM2835 SDHOST MMC Controller support under the MMC / SD section(s), obviously a fair number of things ( in kernel and modules ) would need to be added also to enable everything. When it comes to firmware and device tree's perhaps this would help there, https://github.com/raspberrypi/linux/issues/3237 Let us know what you get working going forward Nige On Tue, Dec 31, 2019 at 11:23 PM Nigel Sollars <[email protected]> wrote: > > Just took a look at the bootlog there, those GPIO failures arnt > clever, missing firmware I would take a wild guess that things in the > latest kernel tree has changed I did also see an article about newer > support for the Pi 4 in the latest kernel ( cant remember if its 5.4 > or 5.5 ). Do you use 'make menuconfig'?. the size difference you > mention with those errors do point to you not enabling the needful > > Looks like 4.19 has been the latest for along time, I would diff your > 5.5 config with the 4.19 and see what you have missing / what has > moved / changed. A quick google does not yield much so you could be > very much on your own / pioneering this one. > > Hopefully helpful links > > Someone to perhaps reach out to for info, > https://forum.manjaro.org/t/raspberry-pi-4-5-4-1-kernel/114273 > > 5.5 Graphics / better support by all accounts, > > https://www.phoronix.com/scan.php?page=article&item=linux-55-features&num=1 > https://www.linux-arm.info/index.php/1537-linux-5-5-lands-broadcom-bcm2711-raspberry-pi-4-bits > > again hope this helps > > Nige > > On Tue, Dec 31, 2019 at 5:18 AM basti <[email protected]> wrote: > > > > Hello, > > > > I have try to build kernel for raspi4 from upstream (5.5-rc3). Kernel > > boot but can't find the SD Card, so there is no partition, no root-fs > > and end up in initramfs/busybox. > > > > Log of serial console is attached. I have used U-boot and dtb from > > ubuntu image. My dtb build during kernel build is a half size of the > > ubuntu one and doesn't work. > > > > the custom build kernel works on rpi3 out of the box. > > > > best regards > > > > p.s. i build it as deb package > > > > > > > -- > “Science is a differential equation. Religion is a boundary condition.” > > Alan Turing -- “Science is a differential equation. Religion is a boundary condition.” Alan Turing
