Re: [Qemu-devel] [PATCH] Revert "armv7m: Guard against no -kernel argument"

[Stefan Hajnoczi]

On Thu, Apr 25, 2019 at 08:07:06PM +0200, Philippe Mathieu-Daudé wrote:
> On 1/4/19 4:16 PM, Peter Maydell wrote:
> > On Thu, 3 Jan 2019 at 14:41, Stefan Hajnoczi <address@hidden> wrote:
> >>
> >> This reverts commit 01fd41ab3fb69971c24a69ed49cde96086d81278.
> >>
> >> The generic loader device (-device loader,file=kernel.bin) can be used
> >> to load a kernel instead of the -kernel option.  Some boards have flash
> >> memory (pflash) that is set via the -pflash or -drive options.
> >>
> >> Allow starting QEMU without the -kernel option to accommodate these
> >> scenarios.
> >>
> >> Suggested-by: Peter Maydell <address@hidden>
> >> Signed-off-by: Stefan Hajnoczi <address@hidden>
> 
> Previous to this commit (v3.1), we have:
> 
> $ qemu-system-aarch64 -M netduino2
> qemu-system-aarch64: Guest image must be specified (using -kernel)
> 
> Now (v4.0) we get:
> 
> $ qemu-system-aarch64 -M netduino2
> qemu: fatal: Lockup: can't escalate 3 to HardFault (current priority -1)

A user-friendly error message is needed here.  The check for -kernel was
too specific and is not desirable for microbit where we use -device
loader.

Old boards probably want to continue using -kernel.  New boards like
microbit may use just -device loader.  Perhaps there is even a group
that wants both options.

A solution is to introduce explicit checks so that we can tell the user
the appropriate option for the machine type.  I can work on this if you
like, but probably won't be able to send a patch until Tuesday.

Stefan

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