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>
On slow configurations (ex iCEBreaker / SERV CPU / 12MHz SPI Flash freq) memspeed test was
too slow (>200s to do the random test for 1MB), so reduce test size to 4KB.
This will be less accurate but will still provide representative results which
is the aim of this test.
Integration from #1024 was working on some boards (ex Arty) but breaking others (ex iCEBreaker);
simplify things for now:
- Avoid duplication in spiflash_freq_init.
- Avoid passing useless SPIFLASH_LEGACY flag to software (software can detect it from csr.h).
- Only keep integration support for "legacy" PHY, others are not generic enough and can be passed with phy parameter.
litex_sim: SoC without RAM/SDRAM.
litex_sim --integrated-main-ram-size=0x1000: SoC with RAM of size 0x1000.
litex_sim --with-sdram: SoC with SDRAM.
litex_sim --integrated-main-ram-size=0x1000 --with-sdram: SoC with RAM (priority to RAM over SDRAM).
Michal Sieron
Florent Kermarrec
George Hilliard
Leon Schuermann
Camilo Andres Vera Ruiz
Stafford Horne
Nathaniel R. Lewis
wuhanstudio