nuttx

History

YAMAMOTO Takashi 58bdcbab9b Revert "Make: use gcc as LD" This reverts commit `45672c269d`. Because: * It's very confusing to have cc as LD. * I don't see what "-nostartfiles -nodefaultlibs" in LDFLAGS are supposed to do when we use LD directly. It would be simpler to remove them from our LDFLAGS.		2021-09-08 09:40:48 +08:00
..
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	Revert "Make: use gcc as LD"	2021-09-08 09:40:48 +08:00
src	Rename CONFIG_LIB_BOARDCTL to CONFIG_BOARDCTL	2021-08-06 13:58:26 +02:00
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.