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Diff for /wikisrc/users/jakllsch.mdwn between versions 1.3 and 1.5

version 1.3, 2009/10/29 16:34:05 version 1.5, 2011/07/30 15:09:56
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 # Jonathan Kollasch  # Jonathan Kollasch
   
   ## [[!template id=man name="ddb" section="4"]] tips
   
   ### locating a softc
   This locates a device's softc using it's `cfdriver_t` (e.g. `&mainbus_cd`, `&cpu_cd`) and its "device unit" (e.g. the `0` in `mainbus0`).
   
       db{0}> call device_lookup_private(ohci_cd, 0)
       0xffff800045fb2008
   
   ### locating structure members
   This uses [[!template id=man name="gdb" section="1"]] and a kernel with debugging symbols to find the offset to a element in a structure.
   
       $ gdb netbsd.gdb
       ...
       (gdb) print &((struct ohci_softc *)0)->iot
       $3 = (bus_space_tag_t *) 0x478
       (gdb) print &((struct ohci_softc *)0)->ioh
       $4 = (bus_space_handle_t *) 0x480
   
   ### peeking at mapped registers
   
       db{0}> call bus_space_read_4(*(ffff800045fb2008+478), *(ffff800045fb2008+480), 0)
       0x110
   
 ## Unfinished Projects  ## Unfinished Projects
   
 ### x86 UEFI kernel loader  ### x86 UEFI kernel loader
Line 13  Boots multiuser on NFS root, needs more  Line 36  Boots multiuser on NFS root, needs more 
 This project is on hold until there's a miniature userland that fits in 4-8MiB flash storage devices, on a flash-oriented file system.  This project is on hold until there's a miniature userland that fits in 4-8MiB flash storage devices, on a flash-oriented file system.
 [[!template id=man name="bce" section="4"]] and [[!template id=man name="bwi" section="4"]] would need refactoring to be bus-independent.  [[!template id=man name="bce" section="4"]] and [[!template id=man name="bwi" section="4"]] would need refactoring to be bus-independent.
   
 ### Conexant PCI DTV driver  
 I have some code for 23880-3 and 887 host interfaces.  
 This type of hardware is hard to find freely available docs for.  
 Tuner/demod drivers from Linux could be ported, but would still be GPLed.  
 Probably better to keep these drivers in userland.  
   
 Should try to coordinate with what FreeBSD is doing: <http://wiki.freebsd.org/HDTV>.  
   
 ### Memory-mapped PCI config access on x86  ### Memory-mapped PCI config access on x86
 Needs cleanup, and maybe some more validation of MCFG tables.  Needs cleanup, and maybe some more validation of MCFG tables.
   
 ### Toshiba ACPI LCD backlight driver  
 Loosly based on [[!template id=man name="vald" section="4"]]. Currently attaches to `TOS1900`/`VALZ`, but doesn't interact with this device.  
 This driver should really attach to `\_SB.PCI0.GFX0.LCD` or  
 `\_SB.PCI0.PEGP.VGA.LCD`, which are the devices that get notified of  
 brightness button pushes, and contain the `_BCL`, `_BCM`, and `_BQC`  
 methods that access the brightness adjustment function.  
 Such an attachment does not appear to be possible (or at the very least, easy)  
 at present.  
   
 ## Possible Projects  
 ### AMD PowerNow/Cool'n'Quiet states loaded from ACPI tables  
   
Removed from v.1.3  
changed lines
  Added in v.1.5

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