Hi Alex,
> -----Original Message----- > From: U-Boot [mailto:u-boot-boun...@lists.denx.de] On Behalf Of > Alexander Graf > Sent: Friday, May 13, 2016 5:52 PM > To: u-boot@lists.denx.de > Subject: [U-Boot] [PATCH 2/5] ls2080: Disable dcache during ddr init > > While trying something completely different I saw the DDR probe hang on > boot reliably depending on how big my code ended up. Adding simple "nop" > instructions in my code (completely unrelated) flow made the DDR probe > work again. > > So we're accessing some RAM - probably the page table - and rely on the > cache to give us a correct view of the world while DRAM gets initialized. > > This patch just disables dcache while we're initializing the memory > controller, > resolving all system hangs for me so far. > > Signed-off-by: Alexander Graf <ag...@suse.de> > While testing Linux with your patch set, I found Linux boot crashing. I tried git-bisect and find out this patch is creating problem It is very strange!! --prabhakar [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Linux version 4.1.8+ (prabhu_kush@OptiPlex-790) (gcc version 4.8.3 20131202 (prerelease) (crosstool-NG linaro-1.13.1-4.8-2013.12 - Linaro GCC 2013.11) ) #1 SMP PREEMPT Wed May 18 17:10:46 IST 2016 [ 0.000000] CPU: AArch64 Processor [411fd071] revision 1 [ 0.000000] Detected PIPT I-cache on CPU0 [ 0.000000] alternatives: enabling workaround for ARM erratum 832075 [ 0.000000] alternatives: enabling workaround for ARM erratum 834220 [ 0.000000] earlycon: Early serial console at MMIO 0x21c0600 (options '') [ 0.000000] bootconsole [uart0] enabled [ 0.000000] Bad mode in Error handler detected, code 0xbf000000 -- SError [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.1.8+ #1 [ 0.000000] Hardware name: Freescale Layerscape 2080a RDB Board (DT) [ 0.000000] task: ffff800000b38fc0 ti: ffff800000b2c000 task.ti: ffff800000b2c000 [ 0.000000] PC is at setup_arch+0x294/0x5cc [ 0.000000] LR is at setup_arch+0x290/0x5cc [ 0.000000] pc : [<ffff800000aa8610>] lr : [<ffff800000aa860c>] pstate: 000002c5 [ 0.000000] sp : ffff800000b2ff30 [ 0.000000] x29: ffff800000b2ff30 x28: 00000000a00000e0 [ 0.000000] x27: ffff800000081210 x26: 0000000080c70000 [ 0.000000] x25: 0000000080c6d000 x24: 0000000080000000 [ 0.000000] x23: ffff800000b32000 x22: 0000000000000000 [ 0.000000] x21: ffff800000b2ffe8 x20: ffff800000b32000 [ 0.000000] x19: ffff800000080000 x18: 0000000001002222 [ 0.000000] x17: 0000000000000000 x16: 0000000003010066 [ 0.000000] x15: ffffffffffffffff x14: 0ffffffffffffffe [ 0.000000] x13: 0000000000000020 x12: 0000000000000008 [ 0.000000] x11: 0000000000000004 x10: 0101010101010101 [ 0.000000] x9 : fefefefefefefeff x8 : 7f7f7f7f7f7f7f7f [ 0.000000] x7 : 6466606f64667467 x6 : 0b1a09161f0d0265 [ 0.000000] x5 : 65020d1f16091a0b x4 : 0000000000000000 [ 0.000000] x3 : 36f6e736f6c65000 x2 : 0000000000000087 [ 0.000000] x1 : 0000000000000000 x0 : 0000000000000001 [ 0.000000] [ 0.000000] Internal error: Oops - bad mode: 0 [#1] PREEMPT SMP [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.1.8+ #1 [ 0.000000] Hardware name: Freescale Layerscape 2080a RDB Board (DT) [ 0.000000] task: ffff800000b38fc0 ti: ffff800000b2c000 task.ti: ffff800000b2c000 [ 0.000000] PC is at setup_arch+0x294/0x5cc [ 0.000000] LR is at setup_arch+0x290/0x5cc [ 0.000000] pc : [<ffff800000aa8610>] lr : [<ffff800000aa860c>] pstate: 000002c5 [ 0.000000] sp : ffff800000b2ff30 [ 0.000000] x29: ffff800000b2ff30 x28: 00000000a00000e0 [ 0.000000] x27: ffff800000081210 x26: 0000000080c70000 [ 0.000000] x25: 0000000080c6d000 x24: 0000000080000000 [ 0.000000] x23: ffff800000b32000 x22: 0000000000000000 [ 0.000000] x21: ffff800000b2ffe8 x20: ffff800000b32000 [ 0.000000] x19: ffff800000080000 x18: 0000000001002222 [ 0.000000] x17: 0000000000000000 x16: 0000000003010066 [ 0.000000] x15: ffffffffffffffff x14: 0ffffffffffffffe [ 0.000000] x13: 0000000000000020 x12: 0000000000000008 [ 0.000000] x11: 0000000000000004 x10: 0101010101010101 [ 0.000000] x9 : fefefefefefefeff x8 : 7f7f7f7f7f7f7f7f [ 0.000000] x7 : 6466606f64667467 x6 : 0b1a09161f0d0265 [ 0.000000] x5 : 65020d1f16091a0b x4 : 0000000000000000 [ 0.000000] x3 : 36f6e736f6c65000 x2 : 0000000000000087 [ 0.000000] x1 : 0000000000000000 x0 : 0000000000000001 [ 0.000000] [ 0.000000] Process swapper (pid: 0, stack limit = 0xffff800000b2c020) [ 0.000000] Stack: (0xffff800000b2ff30 to 0xffff800000b30000) [ 0.000000] ff20: 00b2ffa0 ffff8000 00aa5684 ffff8000 [ 0.000000] ff40: 00000001 00000000 00adfb20 ffff8000 9fff9000 00000000 00000000 00000000 [ 0.000000] ff60: 00b32000 ffff8000 80000000 00000000 80c6d000 00000000 80c70000 00000000 [ 0.000000] ff80: ffffffff ffffffff 00000000 00000000 00000080 00000000 fefefefe fefefefe [ 0.000000] ffa0: 00000000 00000000 800826a0 00000000 fff9e7c0 00000000 00000e12 00000000 [ 0.000000] ffc0: 9fff9000 00000000 00000000 00000000 00000000 00000000 80000000 00000000 [ 0.000000] ffe0: 00000000 00000000 00ae0348 ffff8000 00000000 00000000 00000000 00000000 [ 0.000000] Call trace: [ 0.000000] [<ffff800000aa8610>] setup_arch+0x294/0x5cc [ 0.000000] [<ffff800000aa5680>] start_kernel+0x94/0x3bc [ 0.000000] Code: 940009db 94000957 97fff3e4 d50344ff (9400066f) [ 0.000000] ---[ end trace cb88537fdc8fa200 ]--- [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task! [ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
