Use gcc-ar and gcc-nm, because they have LTO plugins
Turn off LTO for libcompiler_rt, exchange.c and arc4random.c
from newlib.
Also add getentropy, dummy function, because for some reason
libbase/console.c wants it.
Picolibc doesn't maintain meson.build or cross*.txt files
for lm32 and or1k CPUs.
This commit adds meson.build files for both of them.
Also libc/Makefile got modifed to determine CPU family
from $(CPU) value and generate cross.txt file.
Now picolibc gets compiled with LiteX flags too.
It doesn't compile on neither of them yet,
but at least riscv still works.
Picolibc requires __iob array for its IO functions
This commit creates such array with dummy functions
using putchar/readchar from console.c
To prevent name conflicts printf and others were
removed from console.c
Also putchar had to be renamed to base_putchar
Right now it is still limited as it compiles only for one target,
but it should be possible to build BIOS with one command
Tested with digilent_arty.py
Adds a switch `--with-gpio`, which will add a 32 pin GPIOTristate
core, with the GPIOTristate signals exposed on the top-level
module. This can be used to add a custom GPIO module in the Verilated
simulation.
Signed-off-by: Leon Schuermann <leon@is.currently.online>
Support exposing tristate GPIOs with tristate pads, by avoiding
instantiation of tristate buffers directly in the module. This gives
the developers more flexibility in how they want to implement their
tristate IOs (for example with level shifters behind the IOs), and
allows to use the GPIOTristate core in the Verilated simulation as
Verilator does not support top-level inout signals.
Signed-off-by: Leon Schuermann <leon@is.currently.online>
I found that in some cases, initialized global variables don't work with user libraries, so a little change to the linker that I use, taken from the demo file, seems to solve the problem . I think that make more sense to put the global variables in sram and initial values in the main_ram, similar to the bios linker.
This allows setting a root device other than ram0, this is useful
when using a rootfs from the SD card. Doing this makes boot time
faster and saves on memory footprint used by an in ram initrd.
Also includes some fixes for the non-last_be test path such that the
expected behavior is the one currently oberserved with the Packetizer
and Depacketizer.
While the Depacketizer did correctly calculate a new last_be value for
the data with the header removed, it may happen that the last_be
overflows and thus relates to the current, non-delayed sink value. The
same goes for the Packetizer, just inversed. This introduces logic in
form of a simple FSM to handle these cases and properly output last_be
on the last valid bus word.
Co-authored-by: David Sawatzke <d-git@sawatzke.dev>
Signed-off-by: Leon Schuermann <leon@is.currently.online>
Michal Sieron
Florent Kermarrec
George Hilliard
Leon Schuermann
Camilo Andres Vera Ruiz
Stafford Horne
Nathaniel R. Lewis