Hello all, I've cross-compiled Linux 4.16 for a AT91SAM9XE512 MPU which uses an ARMv5TEJ instruction set. I'm using a custom board, bootloader, and device tree. On startup, I receive the following kernel panic: Uncompressing Linux... done, booting the kernel. [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.16.0-rc5-FFAero (root@localhost.localdomain) (gcc version 6.2.0 (GCC)) #3 Sat Mar 17 07:51:27 CDT 2018 [ 0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f [ 0.000000] CPU: VIVT data cache, VIVT instruction cache [ 0.000000] OF: fdt: Machine model: FFAero [ 0.000000] bootconsole [earlycon0] enabled [ 0.000000] Memory policy: Data cache writeback [ 0.000000] Kernel panic - not syncing: ERROR: Failed to allocate 0x00002000 bytes below 0x00000000. [ 0.000000] [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.16.0-rc5-FFAero #3 [ 0.000000] Hardware name: Atmel AT91SAM9 [ 0.000000] Backtrace: invalid frame pointer 0xc0a01e68 [ 0.000000] ---[ end Kernel panic - not syncing: ERROR: Failed to allocate 0x00002000 bytes below 0x00000000. [ 0.000000] Here's a copy of the stack trace: (gdb) bt #0 __loop_delay () at arch/arm/lib/delay-loop.S:58 #1 0xc011f69c in panic () #2 0xc0918c9c in memblock_alloc_base (size=8192, align=<optimized out>, max_addr=0) at mm/memblock.c:1229 #3 0xc0918cc4 in memblock_alloc (size=<optimized out>, align=<optimized out>) at mm/memblock.c:1237 #4 0xc0905840 in early_alloc_aligned (sz=3231719088, align=<optimized out>) at arch/arm/mm/mmu.c:724 #5 0xc0905940 in early_alloc (sz=<optimized out>) at arch/arm/mm/mmu.c:731 #6 0xc09060bc in devicemaps_init (mdesc=<optimized out>) at arch/arm/mm/mmu.c:1324 #7 paging_init (mdesc=<optimized out>) at arch/arm/mm/mmu.c:1631 #8 0xc090359c in setup_arch (cmdline_p=0xc0a01fc0) at arch/arm/kernel/setup.c:1120 #9 0xc0900ae8 in start_kernel () at init/main.c:536 #10 0x00000000 in ?? () While spending the last week tracing this issue back through the kernel source code it looks like the "of_get_flat_dt_prop" method is never returning a valid result for any property under the memory node. My decompiled device tree (dtb -> dts) is available here: https://hastebin.com/wopaxiwawo.c Does anybody know what I'm doing wrong/how to fix this issue? Thank you, Fred Heinecke-- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
