[Skiboot] [PATCH] qemu: add NO_RNG quirk

[Cédric Le Goater]

On 11/3/18 1:29 AM, Benjamin Herrenschmidt wrote:
> On Fri, 2018-11-02 at 08:26 +0100, Cédric Le Goater wrote:
>> QEMU does not emulate a NX chip yet.
> 
> What about instead we check for NX in the DT ?

As I understand it, init_chips() defines a set of features the 
platform can not use. It seems cleaner to use than testing for 
the platforms under each driver.    
 
> I'm about to implement the RNG in qemu :-)

Even better :) 

What other chiplets would be interesting to work on ? 

 - PHB4 of course
 - Aspeed MBOX support 
 - CAPP ? 

Cheers,

C. 

> 
>> Signed-off-by: Cédric Le Goater <clg at kaod.org>
>> ---
>>
>>  This is the only patch needed to boot a QEMU PowerNV POWER9 machine
>>  using the Witherspoon OpenPOWER kernel and rootfs files.
>>
>>  QEMU tree is available here :
>>  
>>    https://github.com/legoater/qemu/tree/powernv-3.1
>>
>>  core/chip.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/core/chip.c b/core/chip.c
>> index 65263253424d..48df1f052936 100644
>> --- a/core/chip.c
>> +++ b/core/chip.c
>> @@ -146,7 +146,7 @@ void init_chips(void)
>>  	/* Detect Qemu */
>>  	if (dt_node_is_compatible(dt_root, "qemu,powernv")) {
>>  		proc_chip_quirks |= QUIRK_NO_CHIPTOD | QUIRK_NO_PBA
>> -			| QUIRK_NO_DIRECT_CTL;
>> +			| QUIRK_NO_DIRECT_CTL | QUIRK_NO_RNG;
>>  		prlog(PR_NOTICE, "CHIP: Detected Qemu simulator\n");
>>  	}
>>  
>