nios2 fix for v4.11
- nios2: reserve boot memory for device tree
nios2: reserve boot memory for device tree
Make sure to reserve the boot memory for the flattened device tree.
Otherwise it might get overwritten, e.g. when initial_boot_params is
copied, leading to a corrupted FDT and a boot hang/crash:
bootconsole [early0] enabled
Early console on uart16650 initialized at 0xf8001600
OF: fdt: Error -11 processing FDT
Kernel panic - not syncing: setup_cpuinfo: No CPU found in devicetree!
---[ end Kernel panic - not syncing: setup_cpuinfo: No CPU found in devicetree!
Guenter Roeck says:
> I think I found the problem. In unflatten_and_copy_device_tree(), with added
> debug information:
> OF: fdt: initial_boot_params=c861e400, dt=c861f000 size=28874 (0x70ca)
> ... and then initial_boot_params is copied to dt, which results in corrupted
> fdt since the memory overlaps. Looks like the initial_boot_params memory
> is not reserved and (re-)allocated by early_init_dt_alloc_memory_arch().
Reported-by: Guenter Roeck <email@example.com>
Tested-by: Guenter Roeck <firstname.lastname@example.org>
Signed-off-by: Tobias Klauser <email@example.com>
Acked-by: Ley Foon Tan <firstname.lastname@example.org>
2 files changed