path: root/arch/nios2/kernel
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authorTobias Klauser <tklauser@distanz.ch>2017-04-02 20:08:04 -0700
committerLey Foon Tan <ley.foon.tan@intel.com>2017-04-02 20:13:57 -0700
commit921d701e6f31e1ffaca3560416af1aa04edb4c4f (patch)
tree44cec5977023a0e15e7f5da612405fb174617b97 /arch/nios2/kernel
parenta71c9a1c779f2499fb2afc0553e543f18aff6edf (diff)
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(). Cc: stable@vger.kernel.org Reported-by: Guenter Roeck <linux@roeck-us.net> Reference: http://lkml.kernel.org/r/20170226210338.GA19476@roeck-us.net Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Acked-by: Ley Foon Tan <ley.foon.tan@intel.com>
Diffstat (limited to 'arch/nios2/kernel')
2 files changed, 10 insertions, 0 deletions
diff --git a/arch/nios2/kernel/prom.c b/arch/nios2/kernel/prom.c
index 367c5426157b..3901b80d4420 100644
--- a/arch/nios2/kernel/prom.c
+++ b/arch/nios2/kernel/prom.c
@@ -48,6 +48,13 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
return alloc_bootmem_align(size, align);
+int __init early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
+ bool nomap)
+ reserve_bootmem(base, size, BOOTMEM_DEFAULT);
+ return 0;
void __init early_init_devtree(void *params)
__be32 *dtb = (u32 *)__dtb_start;
diff --git a/arch/nios2/kernel/setup.c b/arch/nios2/kernel/setup.c
index 6e57ffa5db27..6044d9be28b4 100644
--- a/arch/nios2/kernel/setup.c
+++ b/arch/nios2/kernel/setup.c
@@ -201,6 +201,9 @@ void __init setup_arch(char **cmdline_p)
+ early_init_fdt_reserve_self();
+ early_init_fdt_scan_reserved_mem();

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