掌機 - Gaviar (小志掌機) - 解決NR_IRQS: 0, nr_irqs: 0, preallocated irqs: 0, Oops - load access fault [#1]問題


問題如下： 

[    0.000000] Linux version 5.4.61 (steward@debian) (riscv64-unknown-linux-gnu-gcc (C-SKY RISCV Tools V1.8.4 B20200702) 8.1.0, GNU ld (GNU Binutils) 2.32) #3 PREEMPT Tue Sep 8 21:27:48 CST 2026
[    0.000000] earlycon: sbi0 at I/O port 0x0 (options '')
[    0.000000] printk: bootconsole [sbi0] enabled
[    0.000000] cma: Reserved 16 MiB at 0x0000000047000000
[    0.000000] Zone ranges:
[    0.000000]   DMA32    [mem 0x0000000040000000-0x0000000047ffffff]
[    0.000000]   Normal   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000040000000-0x0000000047ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000040000000-0x0000000047ffffff]
[    0.000000] elf_hwcap is 0x20112d
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 32320
[    0.000000] Kernel command line: console=ttyS4,115200n8 debug loglevel=7,initcall_debug=1 init=/init earlycon=sbi
[    0.000000] Dentry cache hash table entries: 16384 (order: 5, 131072 bytes, linear)
[    0.000000] Inode-cache hash table entries: 8192 (order: 4, 65536 bytes, linear)
[    0.000000] Sorting __ex_table...
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 104568K/131072K available (4909K kernel code, 448K rwdata, 1909K rodata, 160K init, 234K bss, 10120K reserved, 16384K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] rcu: Preemptible hierarchical RCU implementation.
[    0.000000]  Tasks RCU enabled.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[    0.000000] NR_IRQS: 0, nr_irqs: 0, preallocated irqs: 0
[    0.000000] Oops - load access fault [#1]
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.4.61 #3
[    0.000000] sepc: ffffffe000205a12 ra : ffffffe00000b832 sp : ffffffe0006d7e10
[    0.000000]  gp : ffffffe000741948 tp : ffffffe0006dc670 t0 : ffffffe0006d7d70
[    0.000000]  t1 : 0000000000000005 t2 : 000000000000043f s0 : ffffffe0006d7ef0
[    0.000000]  s1 : 0000000000000001 a0 : ffffffd000002080 a1 : 0000000000000002
[    0.000000]  a2 : 0000000000000000 a3 : ffffffd000000000 a4 : 0000000000000020
[    0.000000]  a5 : ffffffffffffffff a6 : ffffffe000577be0 a7 : 0000000000000000
[    0.000000]  s2 : ffffffe0006f4bd8 s3 : ffffffe006e0b318 s4 : ffffffe00075d150
[    0.000000]  s5 : 0000000000000000 s6 : 0000000000000002 s7 : ffffffe0005f3c78
[    0.000000]  s8 : ffffffe000621920 s9 : ffffffe0007488a8 s10: 0000000000000001
[    0.000000]  s11: 0000000000200000 t3 : ffffffd004000000 t4 : 9000000004fffcc7
[    0.000000]  t5 : 0000000000000003 t6 : ffffffe0006d7d3c
[    0.000000] sstatus: 0000000200000100 sbadaddr: 0000000010002080 scause: 0000000000000005
[    0.000000] random: get_random_bytes called from init_oops_id+0x26/0x38 with crng_init=0
[    0.000000] ---[ end trace 0000000000000000 ]---
[    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! ]---

解法如下：
首先看到Crash PC位址是位於0x205a12 

[    0.000000] sepc: ffffffe000205a12 ra : ffffffe00000b832 sp : ffffffe0006d7e10
[    0.000000] sstatus: 0000000200000100 sbadaddr: 0000000010002080 scause: 0000000000000005

定位副程式 

$ riscv64-unknown-linux-gnu-addr2line -e vmlinux -f -C 0xffffffe000205a12
    plic_toggle.isra.2
    irq-sifive-plic.c:?

查看Device Tree 

$ vim arch/riscv/boot/dts/sunxi/sun20iw1p1.dtsi
    plic0: interrupt-controller@10000000 {

從OpenSBI列印0x10002080內容，發現內容都是0 

M-mode read 0x10002080 => 0
S-mode read 0x10002080 => 0

開始定位權限問題，發現PLIC_CTRL_REG需要設定才可以存取PLIC內容


於是在OpenSBI跳轉到Kernel前，先設定PLIC存取權限，就可以解掉Crash問題 

*(volatile uint32_t *)0x101ffffc = 1;

Baudrate 115200bps 

[    0.000000] Linux version 5.4.61 (steward@debian) (riscv64-unknown-linux-gnu-gcc (C-SKY RISCV Tools V1.8.4 B20200702) 8.1.0, GNU ld (GNU Binutils) 2.32) #1 PREEMPT Thu Sep 10 22:35:38 CST 2026
[    0.000000] earlycon: sbi0 at I/O port 0x0 (options '')
[    0.000000] printk: bootconsole [sbi0] enabled
[    0.000000] cma: Reserved 16 MiB at 0x0000000047000000
[    0.000000] Zone ranges:
[    0.000000]   DMA32    [mem 0x0000000040000000-0x0000000047ffffff]
[    0.000000]   Normal   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000040000000-0x0000000047ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000040000000-0x0000000047ffffff]
[    0.000000] elf_hwcap is 0x20112d
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 32320
[    0.000000] Kernel command line: console=ttyS4,115200n8 debug loglevel=7,initcall_debug=1 init=/init earlycon=sbi
[    0.000000] Dentry cache hash table entries: 16384 (order: 5, 131072 bytes, linear)
[    0.000000] Inode-cache hash table entries: 8192 (order: 4, 65536 bytes, linear)
[    0.000000] Sorting __ex_table...
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 104568K/131072K available (4909K kernel code, 449K rwdata, 1909K rodata, 160K init, 234K bss, 10120K reserved, 16384K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] rcu: Preemptible hierarchical RCU implementation.
[    0.000000]  Tasks RCU enabled.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[    0.000000] NR_IRQS: 0, nr_irqs: 0, preallocated irqs: 0
[    0.000000] plic: mapped 200 interrupts with 1 handlers for 2 contexts.
[    0.000000] riscv_timer_init_dt: Registering clocksource cpuid [0] hartid [0]
[    0.000000] clocksource: riscv_clocksource: mask: 0xffffffffffffffff max_cycles: 0x588fe9dc0, max_idle_ns: 440795202592 ns
[    0.000125] sched_clock: 64 bits at 24MHz, resolution 41ns, wraps every 4398046511097ns
[    0.008238] riscv_timer_clockevent depends on broadcast, but no broadcast function available
[    0.021298] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[    0.043416] Calibrating delay loop (skipped), value calculated using timer frequency.. 48.00 BogoMIPS (lpj=240000)
[    0.053948] pid_max: default: 32768 minimum: 301
[    0.060648] Mount-cache hash table entries: 512 (order: 0, 4096 bytes, linear)
[    0.068014] Mountpoint-cache hash table entries: 512 (order: 0, 4096 bytes, linear)
[    0.089491] ASID allocator initialised with 65536 entries
[    0.095919] rcu: Hierarchical SRCU implementation.
[    0.105840] devtmpfs: initialized
[    0.342131] random: get_random_u32 called from bucket_table_alloc.isra.27+0x10a/0x12c with crng_init=0
[    0.349219] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.368572] futex hash table entries: 256 (order: 0, 6144 bytes, linear)
[    0.384847] pinctrl core: initialized pinctrl subsystem
[    0.401201] NET: Registered protocol family 16
[    0.425372] DMA: preallocated 256 KiB pool for atomic allocations
[    0.435759] cpuidle: using governor menu
[    0.864565] rtc_ccu: sunxi ccu init OK
[    0.943050] clock: sunxi ccu init OK
[    0.955128] clock: sunxi ccu init OK
[    1.281595] sun6i-dma 3002000.dma-controller: sunxi dma probed
[    1.316158] iommu: Default domain type: Translated 
[    1.322135] sunxi iommu: irq = 4
[    1.336606] SCSI subsystem initialized
[    1.343999] usbcore: registered new interface driver usbfs
[    1.350350] usbcore: registered new interface driver hub
[    1.356590] usbcore: registered new device driver usb
[    1.362847] videodev: Linux video capture interface: v2.00
[    1.376396] Advanced Linux Sound Architecture Driver Initialized.
[    1.389471] Bluetooth: Core ver 2.22
[    1.393475] NET: Registered protocol family 31
[    1.397995] Bluetooth: HCI device and connection manager initialized
[    1.404467] Bluetooth: HCI socket layer initialized
[    1.409454] Bluetooth: L2CAP socket layer initialized
[    1.414767] Bluetooth: SCO socket layer initialized
[    1.421697] pwm module init!
[    1.438662] g2d 5410000.g2d: Adding to iommu group 0
[    1.447448] G2D: rcq version initialized.major:252
[    1.459566] clocksource: Switched to clocksource riscv_clocksource
[    1.644760] sun8iw20-pinctrl 2000000.pinctrl: initialized sunXi PIO driver
[    1.679602] NET: Registered protocol family 2
[    1.693720] tcp_listen_portaddr_hash hash table entries: 256 (order: 0, 4096 bytes, linear)
[    1.702402] TCP established hash table entries: 1024 (order: 1, 8192 bytes, linear)
[    1.710560] TCP bind hash table entries: 1024 (order: 1, 8192 bytes, linear)
[    1.718069] TCP: Hash tables configured (established 1024 bind 1024)
[    1.725104] UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
[    1.732064] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear)
[    1.740853] NET: Registered protocol family 1
[    1.771587] workingset: timestamp_bits=62 max_order=15 bucket_order=0
[    1.892320] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    1.901056] ntfs: driver 2.1.32 [Flags: R/W].
[    2.831877] io scheduler mq-deadline registered
[    2.836472] io scheduler kyber registered
[    2.848914] [DISP]disp_module_init
[    2.858080] disp 5000000.disp: Adding to iommu group 0
[    3.319244] display_fb_request,fb_id:0
[    3.325176] [DISP] Fb_copy_boot_fb,line:1449:
[    3.325230] no boot_fb0
[    3.335539] disp_al_manager_apply ouput_type:0
[    3.341621] [DISP] lcd_clk_config,line:774:
[    3.341861] disp 0, clk: pll(72000000),clk(72000000),dclk(6000000) dsi_rate(72000000)
[    3.341861]      clk real:pll(288000000),clk(288000000),dclk(6000000) dsi_rate(0)
[    3.366295] [DISP]disp_module_init finish
[    3.376543] sunxi_sid_init()783 - insmod ok
[    3.397789] uart uart0: uart0 supply uart not found, using dummy regulator
[    3.407627] sw_uart_request_gpio()1273 - UART0 devm_pinctrl_get() failed! return -19
[    3.415548] uart0: ttyS0 at MMIO 0x2500000 (irq = 18, base_baud = 1500000) is a SUNXI
[    3.429644] sun8iw20-pinctrl 2000000.pinctrl: 2000000.pinctrl supply vcc-pb not found, using dummy regulator
[    3.444651] uart uart4: uart4 supply uart not found, using dummy regulator
[    3.454608] uart4: ttyS4 at MMIO 0x2501000 (irq = 22, base_baud = 1500000) is a SUNXI
[    3.471324] printk: console [ttyS4] enabled setup baud 115200 parity n bits 8, flow n
[    3.471324] printk: console [ttyS4] enabled
[    3.480395] printk: bootconsole [sbi0] disabled
[    3.480395] printk: bootconsole [sbi0] disabled
[    3.499934] misc dump reg init
[    3.523752] libphy: Fixed MDIO Bus: probed
[    3.536492] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    3.544162] sunxi-ehci: EHCI SUNXI driver
[    3.554895] get ehci0-controller wakeup-source is fail.
[    3.562094] sunxi ehci0-controller don't init wakeup source
[    3.568767] [sunxi-ehci0]: probe, pdev->name: 4101000.ehci0-controller, sunxi_ehci: 0xffffffe00076b730, 0x:ffffffd004067000, irq_no:2e
[    3.582892] [sunxi-ehci0]: Not init ehci0
[    3.590936] get ehci1-controller wakeup-source is fail.
[    3.598042] sunxi ehci1-controller don't init wakeup source
[    3.604712] [sunxi-ehci1]: probe, pdev->name: 4200000.ehci1-controller, sunxi_ehci: 0xffffffe00076bec0, 0x:ffffffd00406b000, irq_no:31
[    3.619088] sunxi-ehci 4200000.ehci1-controller: 4200000.ehci1-controller supply drvvbus not found, using dummy regulator
[    3.634144] sunxi-ehci 4200000.ehci1-controller: 4200000.ehci1-controller supply hci not found, using dummy regulator
[    3.649553] sunxi-ehci 4200000.ehci1-controller: EHCI Host Controller
[    3.657523] sunxi-ehci 4200000.ehci1-controller: new USB bus registered, assigned bus number 1
[    3.668805] sunxi-ehci 4200000.ehci1-controller: irq 49, io mem 0x04200000