OPB vs. PLB DDR Memory Controller

OPB vs. PLB DDR Memory Controller

[Thomas Glanzmann]

Hello,
I used secretlabs kernel tree and build my hardware once with the obp
uart and once with the uart lite and compiled in the coresponding
drivers into the linux kernel.

        loaded at:     00400000 004951A0
        board data at: 00000000 0000007C
        relocated to:  0040402C 004040A8
        zimage at:     00404EE5 00492F1A
        avail ram:     00496000 7C9E2378

        Linux/PPC load: root=/dev/nfs rw ip=on
        Uncompressing Linux...done.
        Now booting the kernel

As you can see the embedded boot loader works, but the kernel does not
produce any output. I wonder if I have to configure Linux that it has a
OPB Memory Controller instead of a PLB Memory Controller. I used the
ml403 Option in my kernel config.

        Thomas

Re: OPB vs. PLB DDR Memory Controller

[Andrei Konovalov]

Hello Thomas,

Thomas Glanzmann wrote:
> Hello,
> I used secretlabs kernel tree and build my hardware once with the obp
> uart and once with the uart lite and compiled in the coresponding
> drivers into the linux kernel.
> 
>         loaded at:     00400000 004951A0
>         board data at: 00000000 0000007C
>         relocated to:  0040402C 004040A8
>         zimage at:     00404EE5 00492F1A
>         avail ram:     00496000 7C9E2378
> 
>         Linux/PPC load: root=/dev/nfs rw ip=on

This cmd line doesn't tell the kernel where the console is.
You could try
   "console=ttyS0,9600 root=/dev/nfs rw ip=on" (if the UART is 16x50)
or
   "console=ttyUL0 root=/dev/nfs rw ip=on" (if the UART is UART Lite)

Thanks,
Andrei


>         Uncompressing Linux...done.
>         Now booting the kernel
> 
> As you can see the embedded boot loader works, but the kernel does not
> produce any output. I wonder if I have to configure Linux that it has a
> OPB Memory Controller instead of a PLB Memory Controller. I used the
> ml403 Option in my kernel config.
> 
>         Thomas
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