Re: switch RAM and ROM mode with memory_region_set_readonly

[Peter Maydell]

On Wed, 14 Jul 2021 at 12:13, Hiroko Shimizu <hiroko07168@gmail.com> wrote:
>
> Hello,
> I want to switch  the memory read-only  mode with 
> memory_region_set_readonly() function for writing a value to memory under a 
> specific condition. I checked that I could switch the mode using 
> memory_region_set_readonly(), but I couldn't write a value to the memory 
> region when the mode was false.
> What should I do?

What memory region are you trying to mark read-only ?
In particular, the documentation for memory_region_set_readonly()
says it is only useful for RAM regions (ie MRs which are backed
by a bit of host memory, not by read/write IO function callbacks).

thanks
-- PMM