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.
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.
Thanks and Regards,
Eric Miniere
________________________________
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
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=== Building package "pkg/l4re-core/l4sys" ===
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=== 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
make srcdir=/home/vboxuser/Hyp/L4re/l4re_projects/fiasco/src
objbase=/home/vboxuser/Hyp/L4re/l4re_projects/fiasco_builds/armv8r -f
/home/vboxuser/Hyp/L4re/l4re_projects/fiasco/src/Makefile.sub1
make[1]: Entering directory
'/home/vboxuser/Hyp/L4re/l4re_projects/fiasco_builds/armv8r'
Checking compiler config... unchanged.
make[1]: Leaving directory
'/home/vboxuser/Hyp/L4re/l4re_projects/fiasco_builds/armv8r'
make srcdir=/home/vboxuser/Hyp/L4re/l4re_projects/fiasco/src
objbase=/home/vboxuser/Hyp/L4re/l4re_projects/fiasco_builds/armv8r -f
/home/vboxuser/Hyp/L4re/l4re_projects/fiasco/src/Makefile.sub2 all
make[1]: Entering directory
'/home/vboxuser/Hyp/L4re/l4re_projects/fiasco_builds/armv8r'
... Generating version information
... Making kip.o
In file included from
/home/vboxuser/Hyp/L4re/l4re_projects/fiasco/src/abi/kip-debug.cpp:13,
from auto/kip.cc:4:
/home/vboxuser/Hyp/L4re/l4re_projects/fiasco/src/lib/libc/include/cstring:8:11:
error: 'memccpy' has not been declared in '::'
8 | using ::memccpy;
| ^~~~~~~
make[1]: ***
[/home/vboxuser/Hyp/L4re/l4re_projects/fiasco/src/Makerules.global:87: kip.o]
Error 1
make[1]: Leaving directory
'/home/vboxuser/Hyp/L4re/l4re_projects/fiasco_builds/armv8r'
make: *** [/home/vboxuser/Hyp/L4re/l4re_projects/fiasco/src/Makefile:174: all]
Error 2
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