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Gregory Nutt 2014-10-03 10:20:19 -06:00
parent 7df821b7b9
commit ae065f69c1
1 changed files with 14 additions and 22 deletions
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@ -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/)
^^^^^^^^^^^^^^^