Hello, i am currently working on a GE PPC9A board which has a MPC8641D processor.
My work on this board is currently based on the yocto project (where i also put this issue on the mailinglist) but the issue affects mainly the kernel's SMP feature so i want to share this issue here as well and see if anybody can help: i created a BSP for this board and yocto generates a fully working 3.14 kernel and rootfs as well as devicetree. the only thing which is causing problems is SMP. i included the following kernel options: CONFIG_SMP=y CONFIG_SCHED_SMT=y CONFIG_NR_CPUS=64 Unfortunately, only one CPU is brought up during boot: ... PID hash table entries: 4096 (order: 2, 16384 bytes) Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Sorting __ex_table... Memory: 2066916K/2097152K available (4312K kernel code, 188K rwdata, 952K rodata, 200K init, 131K bss, 30236K reserved, 1310716K highmem) Kernel virtual memory layout: * 0xffbdf000..0xfffff000 : fixmap * 0xff400000..0xff800000 : highmem PTEs * 0xff3dd000..0xff400000 : early ioremap * 0xf1000000..0xff3dd000 : vmalloc & ioremap Preemptible hierarchical RCU implementation. Dump stacks of tasks blocking RCU-preempt GP. RCU restricting CPUs from NR_CPUS=64 to nr_cpu_ids=2. RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2 NR_IRQS:512 nr_irqs:512 16 mpic: Setting up MPIC " MPIC " version 1.2 at fef40000, max 2 CPUs mpic: ISU size: 256, shift: 8, mask: ff mpic: Initializing for 256 sources clocksource: timebase mult[7800001] shift[24] registered Console: colour dummy device 80x25 pid_max: default: 32768 minimum: 301 Mount-cache hash table entries: 2048 (order: 1, 8192 bytes) Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes) mpic: requesting IPIs... ProcePID hash table entries: 4096 (order: 12, 16384 bytes) Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Memory: 2044396k/2097152k available (4464k kernel code, 51632k reserved, 148k data, 145k bss, 196k init) Kernel virtual memory layout: * 0xfffe0000..0xfffff000 : fixmap * 0xff800000..0xffc00000 : highmem PTEs * 0xff3db000..0xff800000 : early ioremap * 0xf1000000..0xff3db000 : vmalloc & ioremap NR_IRQS:512 mpic: Setting up MPIC " MPIC " version 1.2 at fef40000, max 2 CPUs mpic: ISU size: 256, shift: 8, mask: ff mpic: Initializing for 256 sources clocksource: timebase mult[1e00000] shift[22] registered Console: colour dummy device 80x25 Mount-cache hash table entries: 512 smp_prepare_cpus mpic: requesting IPIs ... smp: kicking cpu 1 Processor 1 is stuck. Brought up 1 CPUs NET: Registered protocol family 16 ... GE had also released a kernel for this board (2009 2.6 kernel), SMP seems to fail there as well: ... Kernel virtual memory layout: * 0xfffe0000..0xfffff000 : fixmap * 0xff800000..0xffc00000 : highmem PTEs * 0xff3db000..0xff800000 : early ioremap * 0xf1000000..0xff3db000 : vmalloc & ioremap NR_IRQS:512 mpic: Setting up MPIC " MPIC " version 1.2 at fef40000, max 2 CPUs mpic: ISU size: 256, shift: 8, mask: ff mpic: Initializing for 256 sources clocksource: timebase mult[1e00000] shift[22] registered Console: colour dummy device 80x25 Mount-cache hash table entries: 512 smp_prepare_cpus mpic: requesting IPIs ... smp: kicking cpu 1 Processor 1 is stuck. Brought up 1 CPUs ... Does anybody have an idea what might cause this problem? Kind regards, Chris
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