[Trac #72] LinuxBIOS needs to detect the DCON and communicate that information to the kernel

[Zarro Boogs per Child]

#72: LinuxBIOS needs to detect the DCON and communicate that information to the
kernel
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 Reporter:  JordanCrouse  |        Owner:  JordanCrouse
     Type:  enhancement   |       Status:  new         
 Priority:  high          |    Milestone:  beta        
Component:  linuxbios     |   Resolution:              
 Keywords:                |  
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Old description:

> I have committed Jordan's code to linuxbios.
>
> Will close this ticket as soon as he reports success.
> ron

New description:

 LinuxBIOS should detect and enable the DCON by writing a 0x69 to register
 0x01 (DCON SMBUS slave address = 0x0D). If the write fails, then it should
 be assumed the DCON doesn't exist. The BIOS should set a bit in the CMOS
 if the DCON exists. The ROM kernel will use that bit to determine what
 default mode to use. The main kernel may also use the bit, though it is
 expected that the main kernel will take control of the dcon directly via
 SMBUS. This enhancement has three parts: * smbus_write_byte() support for
 the CS5536. The SMBUS parts in LinuxBIOS need to be straightened out.
 SMBus usage outside of the romcc code has fallen into disuse (rminich). *
 Add the dcon detection code to the OLPC mainboard code and write the CMOS
 bit accordingly. (JordanCrouse?) * Grok the CMOS bit in the kernel and
 setup the video driver accordingly. (JordanCrouse?)

Comment (by rminnich):

 Yikes a paste in the wrong box. I am not used to Trak yet.

 Fix the description back. Sorry.

 I have committed Jordan's code to linuxbios.

 Will close this ticket as soon as he reports success. ron

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Ticket URL: <http://dev.laptop.org/ticket/72#comment:5>
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