Re: [Doubt] PPC Linux Device Tree Update

On 06/11/2012 02:52 AM, Kay One wrote:

Hi All,

Currently I am working on p1020rdb soc for some kernel bringing up activity.
I have come across one requirement to update the memory map (MMAP) of
kernel from evaluation board to
some other board who is having the same soc.

for my eval board I have used the p1020rdb.dts file from 2.6.38 standard
kernel source.

Why not start with the latest version?

(PFA) which is working almost fine.
But, I am really not able to find the following mapping as a part of the
attached dts file what I am using.
Can anyone please point me out that dts file is the only one to search
out following base addresses selected in memory map or is there
some specific file of kernel inside which I will be able to search
through to find the following base addresses?

FFFF_F000 	4 KB 	.bootpg

This is not expressed in the device tree, though it is marked reserved
by U-Boot in the reserve map (part of the dtb, but not part of the
actual tree).

FFE0_0000 	1 MB 	CCSR

That's the "soc" node.

EC00_0000 	64 MB 	Flash + alias

/localbus@ffe05000/nor@0,0/

...but it's at 0xef00_0000 according to the tree you attached.

Read the ePAPR spec for a description of how the ranges property works.

8000_0000 	1 GB 	PCI[1:2] mem
FFC0_0000 	256 KB 	PCI[1:2] I/O

These are encoded in the ranges property of the relevant PCIe node (see
version 1.0 of the ePAPR spec for how), but I don't see one with those
specific addresses.  I don't know what the [1:2] is supposed to mean.

FFB0_0000 	1 MB 	VTSS

/localbus@ffe05000/L2switch@2,0/

FFA0_0000 	1 MB 	CPLD

Not represented in the device tree.  The device tree shows NAND at this
address.

FF80_0000 	1 MB 	NAND

/localbus@ffe05000/nand@1,0/

...but with a different address, as noted above.

0000_0000 	1 GB 	DDR

/memory

U-Boot fills in the reg property.

-Scott