Re: [BUG] mpc8323_rdb platform doesn't boot since kernel 3.16

Le 06/06/2015 17:32, Rob Herring a écrit :

On Sat, Jun 6, 2015 at 6:20 AM, christophe leroy
[off-list ref] wrote:

quoted

I've got a MPC8323 RDB evaluation platform from freescale
kernel 4.0 doesn't boot
kernel 3.16 doesn't boot
kernel 3.15 boots ok

I disected the issue down to your commit "of/fdt: Convert FDT functions to
use libfdt" (e6a6928c3ea1d0195ed75a091e345696b916c09b)

Do you have an idea of what the issue could be ?

Is your dtb older version of the dtb format (before 0x10)? libfdt
doesn't work on the older versions.

Yes, dtb has version 0x11, which seems to be the issue (see below)

If not, do you have logs with debug enabled in drivers/of/fdt.c?

I get "unflatten: error -11 processing FDT"

Indeed, Uboot (version 1.1.6 - installed on that evaluation board) adds 
a node called "chosen" at the end of the BLOB.
But Uboot doesn't update the FDT len in the BLOB header, therefore the 
following test fails in fdt_offset_ptr()

     if (fdt_version(fdt) >= 0x11)
         if (((offset + len) < offset)
             || ((offset + len) > fdt_size_dt_struct(fdt)))
             return NULL;


If I comment this test out, Linux 3.16 to 4.0 work properly on my 
evaluation board.

Can we find a proper workaround for this issue ?

Christophe