linux-kernel - Re: 2 small kernel config issues related to UML + RTC

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Message-ID: <4DE31A2E.70705@st.com>
Date:	Mon, 30 May 2011 06:16:46 +0200
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	Valdis.Kletnieks@...edu
Cc:	Toralf Förster <toralf.foerster@....de>,
	user-mode-linux-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: 2 small kernel config issues related to UML + RTC

Hi Valdis

On 5/29/2011 7:17 PM, Valdis.Kletnieks@...edu wrote:
> On Sun, 29 May 2011 11:22:01 +0200, Toralf Förster said:
>>   â”‚ Symbol: STMMAC_RTC_TIMER [=n]                        
>>   â”‚ Type  : boolean
>>   â”‚ Prompt: Real time clock
>>   â”‚   Defined at drivers/net/stmmac/Kconfig:50
>>   â”‚   Depends on: <choice> && RTC_CLASS
>>   â”‚   Location:
>>   â”‚     -> Network device support (NETDEVICES [=y])
>>   â”‚       -> Ethernet (1000 Mbit) (NETDEV_1000 [=n])
>>   â”‚         -> STMicroelectronics 10/100/1000 Ethernet driver (STMMAC_ETH [=n])
>>   â”‚           -> STMMAC Timer optimisation (STMMAC_TIMER [=n])
>>   â”‚             -> Select Timer device (<choice> [=n])
> 
> Ouch. That has to be the strangest place one could *possibly* put an RTC driver. ;)
> 
> Giuseppe - is that RTC driver *really* an integral part of the chipset and
> won't work without the Ethernet parts, or should the driver code for the RTC
> live elsewhere in the tree?

No the external RTC (or the SH-4 TMU) HW can be used by the driver to
handle the rx/tx process mitigating the DMA interrupts. This is not the
best approach but it actually helped many people to space the CPU
especially on old chips w/o dedicate timer.

It's likely I will remove all this code as soon as I work on a chip with
the embedded watchdog.

Regards
Giuseppe
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