On Thursday, 9 September 2021 14:18:50 CEST H. Nikolaus Schaller wrote: > But in the meantime I got another hint: maybe the same reason why the SD > size limits exist. > > Pi 0, 1, 2 use an ARMv6 while the others (except Pi 4) use ARMv7.
I assumed you already knew about that. :-) I think 2 uses an ARMv7 core: https://en.wikipedia.org/wiki/Raspberry_Pi#Specifications > This finally explained to me why there is kernel.img and kernel7.img... > It is not strictly necessary to have two kernel builds and it turned out > that changing the letux_defconfig from > > # CONFIG_ARCH_MULTI_V6 is not set > CONFIG_ARCH_MULTI_V7=y > CONFIG_ARCH_MULTI_V6_V7=y > > to > > CONFIG_ARCH_MULTI_V6=y > CONFIG_ARCH_MULTI_V7=y > CONFIG_ARCH_MULTI_V6_V7=y > > makes the kernel start on both :) Well, there are differences > (single core vs. quad core, different memory size etc.) but this > is taken care of by device tree and kernel. > > But it fails running the Debian rootfs binaries (at least the > one I have tried so far). The same µSD plugged into the 3b+ boots > and runs fine. > > So there must be something special in Raspbian or Debian for ARMv6. My understanding was that Raspbian was initially a complete rebuild of Debian for ARMv6. According to the Debian Wiki: "Raspberry Pi OS builds a single image for all of the Raspberry families, so you will get an armhf 32-bit, hard floating-point system, but built for the ARMv6 ISA (with VFP2), unlike Debian's ARMv7 ISA (with VFP3) port." [https://wiki.debian.org/RaspberryPi] So it's likely that stock Debian binaries won't run on a Pi Zero. David _______________________________________________ Community mailing list [email protected] http://lists.goldelico.com/mailman/listinfo.cgi/community http://www.tinkerphones.org
