diff options
Diffstat (limited to 'nuttx/TODO')
| -rw-r--r-- | nuttx/TODO | 36 |
1 files changed, 14 insertions, 22 deletions
diff --git a/nuttx/TODO b/nuttx/TODO index fe15f1b1e..589653a67 100644 --- a/nuttx/TODO +++ b/nuttx/TODO @@ -23,7 +23,7 @@ nuttx/ (1) Pascal add-on (pcode/) (1) Documentation (Documentation/) (3) Build system / Toolchains - (4) Linux/Cywgin simulation (arch/sim) + (3) Linux/Cywgin simulation (arch/sim) (4) ARM (arch/arm/) (1) ARM/C5471 (arch/arm/src/c5471/) (3) ARM/DM320 (arch/arm/src/dm320/) @@ -1309,6 +1309,19 @@ o Linux/Cywgin simulation (arch/sim) Status: Open Priority: Low (unless you want to test networking features on the simulation). + Title: SIMULATOR HAS NO INTERRUPTS (NON-PREMPTIBLE) + Description: The current simulator implementation is has no interrupts and, hence, + is non-preemptible. Also, without simulated interrutps, there can + be no high-fidelity simulated device drivers. + + Currently, all timing and serial input is simulated in the IDLE loop: + When nothing is going on in the simulation, the IDLE loop runs and + fakes timer and UART events. + Status: Open + Priority: Low, unless there is a need for developing a higher fidelity simulation + I have been thinking about how to implement simulated interrupts in + the simulation. I think a solution would work like this. + Title: ROUND-ROBIN SCHEDULING IN THE SIMULATOR Description: Since the simulation is not pre-emptible, you can't use round-robin scheduling (no time slicing). Currently, the timer interrupts are @@ -1320,27 +1333,6 @@ o Linux/Cywgin simulation (arch/sim) Status: Open Priority: Low - Title: NSH ISSUES ON THE SIMULATOR - Descripion: The NSH example has some odd behaviors. Mult-tasking -- for example, - execution of commands in background -- does not work normally. This - is due to the fact that NSH uses the system standard input for the - console. This means that the simulation is actually "frozen" all of - the time when NSH is waiting for input and background commands never - get the chance to run. - Status: Open - Priority: This will not be fixed. This is the normal behavior in the current - design of the simulator. "Real" platforms will behave correctly - because NSH will "sleep" when it waits for console inpu and other - tasks can run freely. - - Title: DOUBLE COMMAND ECHO - Description: In the NSH example, the host HOST echoes each command so after you - you enter a command, the command is repeated on the next line. This - is an artifact of the simulator only. - Status: Open - Priority: This will not be fixed. This is the normal behavior in the current - design of the simulator. "Real" platforms will behave correctly. - o ARM (arch/arm/) ^^^^^^^^^^^^^^^ |