Hi Eric, On Tue Mar 25, 2025 at 18:03:21 +0000, Eric Miniere wrote: > Hello Adam, > > Thank you for your interesting inputs. > > I would like now to modify the given example supplied (GitHub - > kernkonzept/demo-l4re-micro-hypervisor: L4Re Micro Hypervisor demo for > Cortex-R52 and > Cortex-R82<https://github.com/kernkonzept/demo-l4re-micro-hypervisor>) that > run on Cortex R52, to adapt it to my board and add some "hello world" guests > at first. > I did not find a doc/guide to change this example in particular.
Thanks for pointing this out. This repo is actually old and outdated, we're in progress of retiring it. > I followed the guide https://l4re.org/getting_started/make.html, but I did > not manage to cross compile with the tool chain > gcc-arm-none-eabi-10.3-2021.10. I hit errors when cross compiling L4re or > fiasco for FVP platform with armv8R (see attached log). > > What would be your advice to avoid troubles at that stage ? I don't care to > use an old version, this is just for feasibility purpose. Please use an arm-linux-gnueabihf-* toolchain instead of the arm-none-eabi one. That should fix both issues. Further, the amount of packages for the Cortex-R could be stripped down as, for example, the AHCI block driver will not be of any use on a typical R52 platform. But probably does not harm compiling it. Adam > ________________________________ > From: Adam Lackorzynski > Sent: Saturday, March 22, 2025 12:42 AM > To: Eric Miniere; [email protected] > Cc: Nicola Bruno > Subject: Re: L4re RAM/Flash usage and scheduling timing Info > > [You don't often get email from [email protected]. Learn why this is important at > https://aka.ms/LearnAboutSenderIdentification ] > > Hi, > > On Tue Mar 18, 2025 at 10:11:54 +0000, Eric Miniere via l4-hackers wrote: > > I am looking for an estimate of the memory footprint to run the hypervisor > > L4RE on a quad Core ARM Cortex R52. > > Does it run directly from flash or it needs to be copied to run in RAM ? > > same question for Guests OS (ie FreeRtos)? > > It can also run from flash. A guest as well I believe, but we never > tried I think. > > > What could be the minimal needed L4RE footprint for code and data ? > > Depends on the config of course. Last time we checked, a config for > 16VMs was around 400k. We're constantly trying to improve here. > For the ratio between code/data I do not have numbers at hand but a good > part is code that could/would be running off flash. > > > Also if someone could share a rough idea of scheduling time for an ARM R52 > > running at 400Mhz ? or nb of cycle it takes to schedule ? > > On a Cortex-A53 (in-order) we're short over 2000 cycles in the > measurements for a timer interrupt triggered switch, which would > translate to 5µs at 400MHz. If VMs would be involved a little bit more > because of the added state to swtich. I'd assume it would be in similar > range on R52. > > > Adam > make[1]: Entering directory '/home/vboxuser/Hyp/L4re/l4re_projects/l4' > make[3]: Nothing to be done for 'all'. > make[3]: Nothing to be done for 'all'. > make[4]: Nothing to be done for 'all'. > === Building package "pkg/l4re-core/uclibc-headers" === > === Building package "pkg/l4re-core/libclang_rt-crt" === > make[3]: Nothing to be done for 'all'. > === Building package "pkg/l4re-core/libgcc-crt" === > === Building package "pkg/l4re-core/compiler-rt-crt" === > make[2]: Nothing to be done for 'all'. > === Building package "pkg/l4re-core/ldscripts" === > === Building package "pkg/l4re-core/libclang_rt-pure" === > make[3]: Nothing to be done for 'all'. > === Building package "pkg/l4re-core/libgcc-pure" === > === Building package "pkg/l4re-core/libgcc_eh-headers" === > make[4]: Nothing to be done for 'all'. > make[4]: Nothing to be done for 'all'. > make[4]: Nothing to be done for 'all'. > make[4]: Nothing to be done for 'all'. > === Building package "pkg/l4re-core/libgcc_eh-pure" === > === Building package "pkg/l4re-core/libunwind_llvm-pure" === > make[3]: Nothing to be done for 'all'. > === Building package "pkg/l4re-core/compiler-rt-pure" === > make[2]: Nothing to be done for 'all'. > === Building package "pkg/l4re-core/libstdc++-headers" === > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/exception > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/new > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/typeinfo > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/cxxabi.h > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/bits/exception_defines.h > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/bits/cxxabi_forced.h > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/cxxabi_forced.h > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/bits/hash_bytes.h > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/bits/atomic_lockfree_defines.h > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/bits/exception.h > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/bits/cxxabi_init_exception.h > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/initializer_list > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/bits/exception_ptr.h > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/bits/nested_exception.h > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/compare > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/cassert > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/cctype > 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/home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/system_error > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/thread > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/tuple > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/typeindex > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/type_traits > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/unordered_map > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/unordered_set > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/utility > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/valarray > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/variant > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/vector > [libstdc++-headers] ==> Updating symlinks > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/include/contrib/libstdc++-v3/version > [libstdc++-headers] ==> Updating symlinks > === Building package "pkg/l4re-core/l4sys" === > === Building package "pkg/l4re-core/libclang_rt" === > make[3]: Nothing to be done for 'all'. > === Building package "pkg/l4re-core/libgcc" === > === Building package "pkg/l4re-core/libgcc_eh" === > === Building package "pkg/l4re-core/libunwind_llvm" === > make[3]: Nothing to be done for 'all'. > === Building package "pkg/l4re-core/compiler-rt" === > make[2]: Nothing to be done for 'all'. > === Building package "pkg/l4re-core/crtn" === > === Building package "pkg/l4re-core/l4util" === > === Building package "pkg/l4re-core/cxx" === > === Building package "pkg/l4re-core/cxx_libc_io" === > === Building package "pkg/l4re-core/l4re" === > === Building package "pkg/l4re-core/l4re_c" === > === Building package "pkg/l4re-core/l4re_vfs" === > === Building package "pkg/l4re-core/libc_backends" === > === Building package "pkg/l4re-core/uclibc" === > === Building package "pkg/acpica" === > === Building package "pkg/ada/libgnat" === > [32mlibgnat requires the gnatmake (arm-none-eabi-gnatmake -q) compiler to be > installed[0m > make[2]: Nothing to be done for 'all'. > === Building package "pkg/l4re-core/libsupc++" === > === Building package "pkg/ada/examples" === > [32mAda compiler (gnatmake) missing, skipping directory > '/home/vboxuser/Hyp/L4re/l4re_projects/l4/pkg/ada/examples/ada-hello'.033[0m > [32mPackage dependencies missing: [1mlibgnat[22m; skipping directory > '/home/vboxuser/Hyp/L4re/l4re_projects/l4/pkg/ada/examples/ada-hello'.[0m > make[3]: Nothing to be done for 'all'. > === Building package "pkg/drivers-frst" === > === Building package "pkg/l4virtio" === > === Building package "pkg/l4re-core/libstdc++-v3" === > === Building package "pkg/libblock-device" === > === Building package "pkg/io/libvbus" === > === Building package "pkg/ahci-driver" === > [ahci-driver] ==> Linking ahci-drv > arm-none-eabi-ld: > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/lib/arm_armv8r/std/l4f/libc.a(__h_errno_location.o): > in function `__h_errno_location': > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/pkg/l4re-core/uclibc/lib/uclibc/src/libc/misc/internals/__h_errno_location.c:17: > undefined reference to `__emutls_v.__libc_h_errno' > make[5]: *** [/home/vboxuser/Hyp/L4re/l4re_projects/l4/mk/prog.mk:153: > ahci-drv] Error 1 > make[4]: *** [../../../../mk/binary.inc:188: > /home/vboxuser/Hyp/L4re/l4re_projects/l4re_builds/armv8r/pkg/ahci-driver/server/src/OBJ-arm_armv8r-std-l4f] > Error 2 > make[3]: *** [../../../mk/subdir.mk:43: src] Error 2 > make[2]: *** [../../mk/subdir.mk:43: server] Error 2 > make[1]: *** [mk/project.mk:133: pkg/ahci-driver] Error 2 > make[1]: Leaving directory '/home/vboxuser/Hyp/L4re/l4re_projects/l4' > make: *** [Makefile:6: do-all-make-goals] Error 2 _______________________________________________ l4-hackers mailing list -- [email protected] To unsubscribe send an email to [email protected]
