my problem using iBook G4

[Nathan Whitehorn]

Marcel Moolenaar wrote:
> 
> On Nov 15, 2008, at 12:09 AM, Weongyo Jeong wrote:
> 
>> On Fri, Nov 14, 2008 at 09:25:34AM -0600, Nathan Whitehorn wrote:
>>> Nathan Whitehorn wrote:
>>>> Weongyo Jeong wrote:
>>>>> Hello,
>>>>>
>>>>> I have a iBook G4 laptop but it has a problem when booting like as
>>>>> follows:
>>>>>
>>>>>   http://weongyo.org/project/freebsd/images/20081114.jpg
>>>>>
>>>>> My booting steps are:
>>>>>
>>>>>   1. press <option>+<apple>+O+F
>>>>>   2. 0 > boot cd:,\boot\loader hd:7
>>>>>   3. then a panic during booting progress
>>>>>
>>>>> There's no problem to boot if I set `OK set hw.ata.atapi_dma=0'. Is 
>>>>> it a
>>>>> known issue?
>>>>
>>>> Well, Marcel has seen something similar with his CD drive, but I was
>>>> hoping it was limited to his machine. If you are in a situation where
>>>> you can easily apply patches, could you try the attached one and report
>>>> what it prints for the firmware timing register? Marcel, could you try
>>>> this too?
>>>
>>> Naturally, I forgot the patch. It lives at
>>> http://people.freebsd.org/~nwhitehorn/ata.debug.diff, and should be
>>> applied to ata_kauai.c. Thanks!
>>
>> The below is the result written by my hand but expect the value is
>> correct.
>>
>> ata1: <Intrepid Kauai ATA Controller> mem ~~~~~~~ irq 39 at device 13.0
>> on pci2
>> ata1: Firmware configured PIO register: 0x6149246
>> ata1: Firmware configured UDMA register: 0x2921
> 
> Same here:
> 
> ata1: <Intrepid Kauai ATA Controller> mem 0xf5004000-0xf5007fff \
>     irq 39 at device 13.0 on pci2
> ata1: Firmware configured PIO register: 0x6149246
> ata1: Firmware configured UDMA register: 0x2921
> 

Interesting - that isn't what I expected at all. According to the tables 
in the Apple and NetBSD drivers 0x6149246 isn't even a valid mode. I 
will try to rewrite the mode setting and initialization logic to 
slavishly follow Apple's driver in the next few days, and see if that 
improves anything. Apple switches the bus to PIO0/WDMA2/UDMA5 at boot, 
which is odd, but maybe is important.
-Nathan