Hi Scott,

On 2019/10/9 15:13, Scott Wood wrote:

On Wed, 2019-10-09 at 14:10 +0800, Jason Yan wrote:

quoted

Hi Scott,

Would you please take sometime to test this?

Thank you so much.

On 2019/9/24 13:52, Jason Yan wrote:

quoted

Hi Scott,

Can you test v7 to see if it works to load a kernel at a non-zero address?

Thanks,

Sorry for the delay.  Here's the output:

Thanks for the test.

## Booting kernel from Legacy Image at 10000000 ...
    Image Name:   Linux-5.4.0-rc2-00050-g8ac2cf5b4
    Image Type:   PowerPC Linux Kernel Image (gzip compressed)
    Data Size:    7521134 Bytes = 7.2 MiB
    Load Address: 04000000
    Entry Point:  04000000
    Verifying Checksum ... OK
## Flattened Device Tree blob at 1fc00000
    Booting using the fdt blob at 0x1fc00000
    Uncompressing Kernel Image ... OK
    Loading Device Tree to 07fe0000, end 07fff65c ... OK
KASLR: No safe seed for randomizing the kernel base.
OF: reserved mem: initialized node qman-fqd, compatible id fsl,qman-fqd
OF: reserved mem: initialized node qman-pfdr, compatible id fsl,qman-pfdr
OF: reserved mem: initialized node bman-fbpr, compatible id fsl,bman-fbpr
Memory CAM mapping: 64/64/64 Mb, residual: 12032Mb

When boot from 04000000, the max CAM value is 64M. And
you have a board with 12G memory, CONFIG_LOWMEM_CAM_NUM=3 means only
192M memory is mapped and when kernel is randomized at the middle of 
this 192M memory, we will not have enough continuous memory for node map.

Can you set CONFIG_LOWMEM_CAM_NUM=8 and see if it works?

Thanks.

Linux version 5.4.0-rc2-00050-g8ac2cf5b4e4a-dirty (scott@snotra) (gcc version 8.
1.0 (GCC)) #26 SMP Wed Oct 9 01:50:40 CDT 2019
Using CoreNet Generic machine description
printk: bootconsole [udbg0] enabled
CPU maps initialized for 1 thread per core
-----------------------------------------------------
phys_mem_size     = 0x2fc000000
dcache_bsize      = 0x40
icache_bsize      = 0x40
cpu_features      = 0x00000000000003b4
   possible        = 0x00000000010103bc
   always          = 0x0000000000000020
cpu_user_features = 0x8c008000 0x08000000
mmu_features      = 0x000a0010
physical_start    = 0xc7c4000
-----------------------------------------------------
CoreNet Generic board
mpc85xx_qe_init: Could not find Quicc Engine node
barrier-nospec: using isync; sync as speculation barrier
Zone ranges:
   Normal   [mem 0x0000000004000000-0x000000000fffffff]
   HighMem  [mem 0x0000000010000000-0x00000002ffffffff]
Movable zone start for each node
Early memory node ranges
   node   0: [mem 0x0000000004000000-0x00000002ffffffff]
Initmem setup node 0 [mem 0x0000000004000000-0x00000002ffffffff]
Kernel panic - not syncing: Failed to allocate 125173760 bytes for node 0 memory
  map
CPU: 0 PID: 0 Comm: swapper Not tainted 5.4.0-rc2-00050-g8ac2cf5b4e4a-dirty #26
Call Trace:
[c989fe10] [c924bfb0] dump_stack+0x84/0xb4 (unreliable)
[c989fe30] [c880badc] panic+0x140/0x334
[c989fe90] [c89a1144] alloc_node_mem_map.constprop.117+0xa0/0x11c
[c989feb0] [c95481c4] free_area_init_node+0x314/0x5b8
[c989ff30] [c9548b34] free_area_init_nodes+0x57c/0x5c0
[c989ff80] [c952cbb4] setup_arch+0x250/0x270
[c989ffa0] [c95278e0] start_kernel+0x74/0x4e8
[c989fff0] [c87c4478] set_ivor+0x150/0x18c
Kernel Offset: 0x87c4000 from 0xc0000000
Rebooting in 180 seconds..

-Scott



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