nuttx

History

Masayuki Ishikawa ee66da4566 boards: sam4cmp-db: Update nsh/defconfig Summary: - This commit removes SMP features from nsh/defconfig because it's still unstable Impact: - None Testing: - None Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>		2021-07-03 04:13:40 -05:00
..
configs/nsh	boards: sam4cmp-db: Update nsh/defconfig	2021-07-03 04:13:40 -05:00
include	boards: arm: Author Masayuki Ishikawa: Update license to Apache	2021-03-14 22:23:05 -07:00
scripts	Make: use gcc as LD	2021-06-10 03:43:18 -07:00
src	boards: nxstyle fixes	2021-03-18 22:58:27 -07:00
Kconfig
README.txt	Remove exra whitespace from files (#189 )	2020-01-31 09:24:49 -06:00

README.txt

README
^^^^^^

README for NuttX port to the SAM4CMP-DB board.

  http://www.atmel.com/tools/SAM4CMP-DB.aspx

The board is intended to test NuttX SMP features for dual Cortex-M4.


Settings
^^^^^^^^
1. Both CPUs are running at 92.160MHz with PLLB.
2. Serial console can be used via on-board USB-UART (115200/8/N/1)
3. Interrupt handlers such as timer and UART are handled on CPU0
4. Both CPUs share internal SRAM0 (128KB)
5. SRAM1 is used to boot CPU1.
6. Cache controllers are disabled because of no snooping features.

Status
^^^^^^
Currently SMP freature works on the board but is not stable.

1. "nsh> sleep 1 &" works without crash.
2. "nsh> smp " sometimes works but some assertions might happen.
3. "nsh> ostest " causes deadlocks during the test.