The byte order (endianness) seems to be swapped when read in 8D-8D-8D in
XIP mode, for most flashes, with the exception of MX which seems to swap
half-words.
This commit adds a flash setting to allow parts to enable half-word swap
when data is written, to fix this issue. By default, only endianness is
fixed.
Tested with both MX and ISSI parts on AE3, flash test and simple file
write/read.
Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
The OSPI controller supports concurrent direct/XIP accesses, there's no
need to disable XIP on direct access. In addition to improving the
performance, this change lays the groundwork for supporting access by
the HP and HE cores simultaneously.
Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
The default dummy cycles may not match the actual flash frequency supported
by a certain board. For example, the MX chip uses 20 dummy cycles by
default which supports up to 200MHz DDR, but the maximum frequency
supported by the AE3 board is 50MHz DDR. So the dummy cycles for this
board can be as low as 6. It's important to set the correct dummy cycles,
as it results in doubling the XIP read speed, in the case of the AE3 board.
Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
This commit enables detecting the flash device in runtime, and uses the
settings of the detected device instead of board-defined flash settings.
Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
This commit adds the beginning of a new alif port with support for Alif
Ensemble MCUs. See https://alifsemi.com/
Supported features of this port added by this commit:
- UART REPL.
- TinyUSB support, for REPL and MSC.
- Octal SPI flash support, for filesystem.
- machine.Pin support.
General notes about the port:
- It uses make, similar to other bare-metal ports here.
- The toolchain is the standard arm-none-eabi- toolchain.
- Flashing a board can be done using either the built-in serial bootloader,
or JLink (both supported here).
- There are two required submodules (one for drivers/SDK, one for security
tools), both of which are open source and on GitHub.
- No special hardware or software is needed for development, just a board
connected over USB.
OpenMV have generously sponsored the development of this port.
Signed-off-by: Damien George <damien@micropython.org>
Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
