I recently upgraded my Yocto based project to Yocto 2.4.2, and I encountered a problem when building my custom kernel for an AT91 SAMA5D3X platform. I've been using an ARM Thumb2 kernel for a while successfully until this release. It appears that the issue stems from the change to binutils version 2.29.1.
Here's a good description of the problem: https://patchwork.kernel.org/patch/10072695/ I tried out their test script, and it flagged the arm-poky-linux-gnueabi- toolchain built by Yocto 2.4.2 as being buggy. Has anyone else encountered this problem and figured out a way around it without disabling Thumb compilation of the kernel? Thanks, Chris The bug showed up in my kernel with the following oops at kernel boot: Internal error: Oops - undefined instruction: 0 [#1] PREEMPT THUMB2 Modules linked in: CPU: 0 PID: 1 Comm: init Not tainted 4.9.91-custom #53 Hardware name: Atmel SAMA5 task: df448000 task.stack: df44a000 PC is at ret_fast_syscall+0x2/0x54 LR is at SyS_brk+0xe9/0x104 pc : [<c0105e62>] lr : [<c016bca1>] psr: 60000013 sp : df44bfa8 ip : 50c5387d fp : 00001000 r10: 00000000 r9 : df44a000 r8 : c0106044 r7 : 0000002d r6 : b6f3e050 r5 : 00010034 r4 : 00000008 r3 : df448000 r2 : ffff0001 r1 : 00000000 r0 : 00bda000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 50c5387d Table: 3ec84059 DAC: 00000051 Process init (pid: 1, stack limit = 0xdf44a210) Stack: (0xdf44bfa8 to 0xdf44c000) bfa0: 00000008 00010034 00000000 00000001 beddcfb8 00000000 bfc0: 00000008 00010034 b6f3e050 0000002d 00000000 00000001 00000001 00001000 bfe0: 00000001 beddce3c b6f54cf4 b6f55b28 20000010 00000000 ec846eac 80cafe65 Code: 0000bd08 00000000 00000000 b6720000 (1000f8d9)
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