Re: Fail to bring hart online on HiFive Unleashed

[Aurelien Jarno <aurelien@aurel32.net>]

On 2019-10-07 22:19, Atish Patra wrote:
> Thanks for the detailed analysis. Can you please keep me and david in
> cc when you report the issue to U-boot ?

Yep. I have progressed a bit on that, and now I am not convinced it's an
U-boot issue, it can be a GCC issue.

Here are the conditions to reproduce the bug:
- U-boot runs on hart 1, 2 or 3
- the autoboot process is not interrupted
- extlinux is used to boot the kernel
- arch/riscv/lib/bootm.c is compiled with GCC 9 (works fine with GCC 8)

When the problem happens, the missing hart actually ends its execution
in an illegal instruction trap trying to execute the FDT (I only noticed
that recently as the message was hidden by the use of earlycon=sbi):

| SiFive FSBL:       2018-03-20
| HiFive-U serial #: 00000246
| 
| OpenSBI v0.4-50-g30f09fb (Oct  6 2019 21:58:05)
|    ____                    _____ ____ _____
|   / __ \                  / ____|  _ \_   _|
|  | |  | |_ __   ___ _ __ | (___ | |_) || |
|  | |  | | '_ \ / _ \ '_ \ \___ \|  _ < | |
|  | |__| | |_) |  __/ | | |____) | |_) || |_
|   \____/| .__/ \___|_| |_|_____/|____/_____|
|         | |
|         |_|
| 
| Platform Name          : SiFive Freedom U540
| Platform HART Features : RV64ACDFIMSU
| Platform Max HARTs     : 5
| Current Hart           : 2
| Firmware Base          : 0x80000000
| Firmware Size          : 104 KB
| Runtime SBI Version    : 0.2
| 
| PMP0: 0x0000000080000000-0x000000008001ffff (A)
| PMP1: 0x0000000000000000-0x0000007fffffffff (A,R,W,X)
| 
| 
| U-Boot 2019.10-rc4-00037-gdac51e9aaf-dirty (Oct 06 2019 - 21:56:51 +0000)
| 
| CPU:   rv64imafdc
| Model: SiFive HiFive Unleashed A00
| DRAM:  8 GiB
| 
| MMC:   spi@10050000:mmc@0: 0
| In:    serial@10010000
| Out:   serial@10010000
| Err:   serial@10010000
| Net:   eth0: ethernet@10090000
| Hit any key to stop autoboot:  0
| switch to partitions #0, OK
| mmc0 is current device
| Scanning mmc 0:2...
| Found /boot/extlinux/extlinux.conf
| Retrieving file: /boot/extlinux/extlinux.conf
| 510 bytes read in 5 ms (99.6 KiB/s)
| U-Boot menu
| 1:      kernel 5.3.4
| 2:      Debian GNU/Linux kernel 5.3.0-trunk-riscv64
| Enter choice: 1
| 1:      kernel 5.3.4
| Retrieving file: /boot/vmlinux-5.3.4
| 9486076 bytes read in 4813 ms (1.9 MiB/s)
| append: root=/dev/mmcblk0p2 rw console=ttySIF0 rootwait
| Retrieving file: /boot/hifive-unleashed-a00.dtb
| 6088 bytes read in 7 ms (848.6 KiB/s)
| ## Flattened Device Tree blob at 88000000
|    Booting using the fdt blob at 0x88000000
|    Using Device Tree in place at 0000000088000000, end 00000000880047c7
| 
| Starting kernel ...
| 
| exception code: 2 , Illegal instruction , epc 88000004 , ra 88000000
| ### ERROR ### Please RESET the board ###
| [    0.000000] OF: fdt: Ignoring memory range 0x80000000 - 0x80200000
| [    0.000000] Linux version 5.3.4+ (aurel32@ohm) (gcc version 9.2.1 20190821 (Debian 9.2.1-4)) #1 SMP Sun Oct 6 11:35:09 UTC 2019
| [    0.000000] initrd not found or empty - disabling initrd
| [    0.000000] Zone ranges:
| [    0.000000]   DMA32    [mem 0x0000000080200000-0x00000000ffffffff]
| [    0.000000]   Normal   [mem 0x0000000100000000-0x000000027fffffff]
| [    0.000000] Movable zone start for each node
| [    0.000000] Early memory node ranges
| [    0.000000]   node   0: [mem 0x0000000080200000-0x000000027fffffff]
| [    0.000000] Initmem setup node 0 [mem 0x0000000080200000-0x000000027fffffff]
| [    0.000000] software IO TLB: mapped [mem 0xfbfff000-0xfffff000] (64MB)
| [    0.000000] CPU with hartid=0 is not available
| [    0.000000] CPU with hartid=0 is not available
| [    0.000000] elf_hwcap is 0x112d
| [    0.000000] percpu: Embedded 18 pages/cpu s36120 r8192 d29416 u73728
| [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 2067975
| [    0.000000] Kernel command line: root=/dev/mmcblk0p2 rw console=ttySIF0 rootwait
| [    0.000000] Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes, linear)
| [    0.000000] Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes, linear)
| [    0.000000] Sorting __ex_table...
| [    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
| [    0.000000] Memory: 8184044K/8386560K available (6310K kernel code, 395K rwdata, 1985K rodata, 239K init, 317K bss, 202516K reserved, 0K cma-reserved)
| [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
| [    0.000000] rcu: Hierarchical RCU implementation.
| [    0.000000] rcu:     RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=4.
| [    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
| [    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=4
| [    0.000000] NR_IRQS: 0, nr_irqs: 0, preallocated irqs: 0
| [    0.000000] plic: mapped 53 interrupts with 4 handlers for 9 contexts.
| [    0.000000] riscv_timer_init_dt: Registering clocksource cpuid [0] hartid [1]
| [    0.000000] clocksource: riscv_clocksource: mask: 0xffffffffffffffff max_cycles: 0x1d854df40, max_idle_ns: 3526361616960 ns
| [    0.000006] sched_clock: 64 bits at 1000kHz, resolution 1000ns, wraps every 2199023255500ns
| [    0.000147] Console: colour dummy device 80x25
| [    0.000184] Calibrating delay loop (skipped), value calculated using timer frequency.. 2.00 BogoMIPS (lpj=4000)
| [    0.000198] pid_max: default: 32768 minimum: 301
| [    0.000685] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes, linear)
| [    0.001026] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes, linear)
| [    0.002814] rcu: Hierarchical SRCU implementation.
| [    0.003280] smp: Bringing up secondary CPUs ...
| [    5.090625] CPU1: failed to come online
| [    5.091815] smp: Brought up 1 node, 3 CPUs

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                 http://www.aurel32.net

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