* Ard Biesheuvel [off-list ref] [170906 11:05]:

On 6 September 2017 at 18:53, Tony Lindgren [off-list ref] wrote:

quoted

* Ard Biesheuvel [off-list ref] [170906 10:31]:

quoted

On 6 September 2017 at 18:12, Tony Lindgren [off-list ref] wrote:

quoted

Kernel image @ 0x81000000 [ 0x000000 - 0x426300 ]
## Flattened Device Tree blob at 84000000
   Booting using the fdt blob at 0x84000000
   Loading Device Tree to 86feb000, end 86fff2d5 ... OK

Starting kernel ...

regions.image_size:00e00000
regions.pa_start:80000000
regions.pa_end:87200000
regions.zimage_start:81000000
regions.zimage_size:00437320
regions.dtb_start:86feb000
regions.dtb_size:00012000
regions.initrd_start:00000000
regions.initrd_size:00000000
num:00000028
num:00000025
*kaslr_offset:05e00000
Uncompressing Linux... done, booting the kernel.
Warning: Neither atags nor dtb found

OK, so in this case, 80000000 + 00e00000 + 05e00000 == 86c00000, which
is still below the DTB, but apparently, it has corrupted it anyway.

I will try to figure out what's going on here.

Do you need to have kaslr_offset beyond the uncompressed
kernel size maybe?

I think the problem is in the rounding of region.pa_start.

I have now changed this to

regions.image_size = image_base % SZ_128M + round_up(image_size, SZ_2M);
regions.pa_start = round_down(image_base, SZ_128M);

...

I have updated my arm-kaslr-v3 with all the fixes from this discussion
(and more)

Looks like your branch at commit 5221c86ad2e7 still failed
after boot attempt #4, see below. Is that the right commit?

Regards,

Tony

8< -----------------
regions.zimage_size:004379e8
regions.dtb_start:86feb000
regions.dtb_size:00012000
regions.initrd_start:00000000
regions.initrd_size:00000000
count:00000028
num:00000025
*kaslr_offset:05e00000
Uncompressing Linux... done, booting the kernel.
Warning: Neither atags nor dtb found