Re: HPA and failed opcode was: 0x37 ?

[Sergei Shtylyov <sshtylyov@ru.mvista.com>]

Hello.

Steven Scholz wrote:

>>Maybe the FPGA is discarding the taskfile writes once the HOB bit is
>>set?  It wouldn't affect the READ NATIVE MAX ADDRESS EXT command being
>>issued since the only the command register matters for that, but it
>>would affect SET MAX ADDRESS EXT working properly.

>>Without a device > 137GB to test with, and without errors on the
>>device, you might not see any odd behavior in normal usage.

>>It's *really* unlikely the drive doesn't have a working taskfile.

> I am sorry. But I don't understand what a "working taskfile" means.
> I don't have CONFIG_IDE_TASK_IOCTL enabled if that means anything.

> The FPGA does nothing except decoding adresseses from the ARM cpu,
> controlling the A[2..0], CS[1..0], IOR, IOW lines of the HDD.

    I've not seen you quoting the code that sets ofsset for the 
IDE_CONTROL_REG, BTW... Without this register, LBA48 is completely broken

> In linux all I do is setting up some hw_regs_t struct (with hw.io_ports[])
> according to my memory map and call ide_register_hw() ...

> So looks like I need to find out more about that taskfile stuff.

    Taskfile is another (and probably an older one) anme for the IDE command 
block registers.

> Steven

MBR, Sergei