Release 17.05, base-hw, environment ROM session denied error

[Norman Feske]

Hi Bob,

> "[init] Error: ctrl_module: environment ROM session denied
> (label="ctrl_module",
> 
> ram_quota=6144, cap_quota=3, diag=0) "
> 
> What is this message telling me?

traditionally, init created the initial sessions (aka environment
sessions) of its children on the children's behalf without considering
any child-specific routing. I.e., a child's PD session, CPU session, the
ROM session with the executable binary, the ROM session with the dynamic
linker were created by init directly via 'Connection' objects.
Therefore, there was no need to route those sessions explicitly in the
configuration.

With version 16.11 and 17.02 [1], we revised the child-creation
procedure. Now, the environment sessions are subjected to the routing
rules as dictated by init's configuration.

[1]
http://genode.org/documentation/release-notes/17.02#Routing_of_environment_sessions

In short, your routing rules for the "ctrl_module" lack a valid route
for the executable binary.

> Also, further down the log is the following output:
> 
> 
>    init -> gpio_drv] resource_request: ram_quota=0,
> cap_quota=4                  
> 
>    [init -> gpio_drv] used before freeing
> emergency=276K                          
> 
>    [init -> gpio_drv] used after freeing emergency=260K   
> 
> I believe these are a result of the gpio server setting up a session
> through the session interface.

The 'gpio_drv' component runs out of its capability quota and politely
asks its parent (init) for more (cap_quota=4). Capability quotas are new
in version 17.05 and are described at [2].

[2]
http://genode.org/documentation/release-notes/17.05#Assignment_and_trading_of_capability_quota

You may try to specify a 'caps=200' attribute to the start node of the
corresponding component.

Cheers
Norman

-- 
Dr.-Ing. Norman Feske
Genode Labs

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