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掌機 - Gaviar (小志掌機) - 解決CLK UNUSED END: pll-cpux-div問題
Kernel Crash問題已經解決，但是從Log的結果來看，Kernel並沒有進入到最後的階段，因為我們尚未描述rootfs位置，理應有VFS Crash的Log才對，所以我們還要繼續追問題
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver sunxi-ehci: EHCI SUNXI driver get ehci0-controller wakeup-source is fail. sunxi ehci0-controller don't init wakeup source [sunxi-ehci0]: probe, pdev->name: 4101000.ehci0-controller, sunxi_ehci: 0xffffffe00051a130, 0x:ffffffd004078000, irq_no:2e [sunxi-ehci0]: Not init ehci0 get ehci1-controller wakeup-source is fail. sunxi ehci1-controller don't init wakeup source [sunxi-ehci1]: probe, pdev->name: 4200000.ehci1-controller, sunxi_ehci: 0xffffffe00051a8c0, 0x:ffffffd00407c000, irq_no:31 sunxi-ehci 4200000.ehci1-controller: 4200000.ehci1-controller supply drvvbus not found, using dummy regulator sunxi-ehci 4200000.ehci1-controller: 4200000.ehci1-controller supply hci not found, using dummy regulator sunxi-ehci 4200000.ehci1-controller: EHCI Host Controller sunxi-ehci 4200000.ehci1-controller: new USB bus registered, assigned bus number 1 sunxi-ehci 4200000.ehci1-controller: irq 49, io mem 0x04200000
先把USB的DTS描述進行關閉來定位問題
&ehci0 {
status = "disabled";
};
&ohci0 {
status = "disabled";
};
關閉後的Kernel Log
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver sunxi-ehci: EHCI SUNXI driver ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver sunxi-ohci: OHCI SUNXI driver usbcore: registered new interface driver uas usbcore: registered new interface driver usb-storage sunxi-rtc 7090000.rtc: errata__fix_alarm_day_reg_default_value(): ALARM0_DAY_REG=0, set it to 1 sunxi-rtc 7090000.rtc: Warning: Using internal RC 16M clock source. Time may be inaccurate! sunxi-rtc 7090000.rtc: Warning: Using internal RC 16M clock source. Time may be inaccurate! sunxi-rtc 7090000.rtc: Warning: Using internal RC 16M clock source. Time may be inaccurate! sunxi-rtc 7090000.rtc: registered as rtc0 sunxi-rtc 7090000.rtc: Warning: Using internal RC 16M clock source. Time may be inaccurate! sunxi-rtc 7090000.rtc: setting system clock to 1970-01-01T00:00:11 UTC (11) sunxi-rtc 7090000.rtc: sunxi rtc probed i2c /dev entries driver sunxi-mmc 4020000.sdmmc: SD/MMC/SDIO Host Controller Driver(v4.25 2022-6-21 13:40) sunxi-mmc 4020000.sdmmc: ***ctl-spec-caps*** 8 sunxi-mmc 4020000.sdmmc: No vmmc regulator found sunxi-mmc 4020000.sdmmc: No vqmmc regulator found sunxi-mmc 4020000.sdmmc: No vdmmc regulator found sunxi-mmc 4020000.sdmmc: No vd33sw regulator found sunxi-mmc 4020000.sdmmc: No vd18sw regulator found sunxi-mmc 4020000.sdmmc: No vq33sw regulator found sunxi-mmc 4020000.sdmmc: No vq18sw regulator found sunxi-mmc 4020000.sdmmc: Got CD GPIO sunxi-mmc 4020000.sdmmc: set cd-gpios as 24M fail sunxi-mmc 4020000.sdmmc: sdc set ios:clk 0Hz bm PP pm UP vdd 21 width 1 timing LEGACY(SDR12) dt B sunxi-mmc 4020000.sdmmc: no vqmmc,Check if there is regulator
接著在Kernel menuconfig也將MMC關閉，DTS裡面除了UART4的SDC也關閉
misc dump reg init brd: module loaded loop: module loaded i2c /dev entries driver ashmem: initialized
但是Kernel還是沒有進入載入init的階段，因此，從initcall印出Log
$ vim init/main.c
1012 static void __init do_initcall_level(int level)
1013 {
1014 int ret = 0;
1015 initcall_entry_t *fn;
1016
1017 strcpy(initcall_command_line, saved_command_line);
1018 parse_args(initcall_level_names[level],
1019 initcall_command_line, __start___param,
1020 __stop___param - __start___param,
1021 level, level,
1022 NULL, &repair_env_string);
1023
1024 trace_initcall_level(initcall_level_names[level]);
1025 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++) {
1026 printk("### INITCALL BEGIN: level=%d fn=%ps ###\n", level, initcall_from_entry(fn));
1027 do_one_initcall(initcall_from_entry(fn));
1028 printk("### INITCALL END: level=%d fn=%ps ret=%d ###\n", level, initcall_from_entry(fn), ret);
1029 }
1030 }
最後出問題的地方在clk_disable_unused
### INITCALL END: level=6 fn=i2c_dev_init ret=0 ### ### INITCALL BEGIN: level=6 fn=sunxi_led_driver_init ### ### INITCALL END: level=6 fn=sunxi_led_driver_init ret=0 ### ### INITCALL BEGIN: level=6 fn=timer_led_trigger_init ### ### INITCALL END: level=6 fn=timer_led_trigger_init ret=0 ### ### INITCALL BEGIN: level=6 fn=defon_led_trigger_init ### ### INITCALL END: level=6 fn=defon_led_trigger_init ret=0 ### ### INITCALL BEGIN: level=6 fn=ashmem_init ### ### INITCALL END: level=6 fn=ashmem_init ret=0 ### ### INITCALL BEGIN: level=6 fn=sunxi_sid_driver_init ### ### INITCALL END: level=6 fn=sunxi_sid_driver_init ret=0 ### ### INITCALL BEGIN: level=7 fn=init_oops_id ### ### INITCALL END: level=7 fn=init_oops_id ret=0 ### ### INITCALL BEGIN: level=7 fn=pm_qos_power_init ### ### INITCALL END: level=7 fn=pm_qos_power_init ret=0 ### ### INITCALL BEGIN: level=7 fn=pm_debugfs_init ### ### INITCALL END: level=7 fn=pm_debugfs_init ret=0 ### ### INITCALL BEGIN: level=7 fn=wakeup_reason_init ### ### INITCALL END: level=7 fn=wakeup_reason_init ret=0 ### ### INITCALL BEGIN: level=7 fn=printk_late_init ### ### INITCALL END: level=7 fn=printk_late_init ret=0 ### ### INITCALL BEGIN: level=7 fn=init_srcu_module_notifier ### ### INITCALL END: level=7 fn=init_srcu_module_notifier ret=0 ### ### INITCALL BEGIN: level=7 fn=tk_debug_sleep_time_init ### ### INITCALL END: level=7 fn=tk_debug_sleep_time_init ret=0 ### ### INITCALL BEGIN: level=7 fn=fault_around_debugfs ### ### INITCALL END: level=7 fn=fault_around_debugfs ret=0 ### ### INITCALL BEGIN: level=7 fn=max_swapfiles_check ### ### INITCALL END: level=7 fn=max_swapfiles_check ret=0 ### ### INITCALL BEGIN: level=7 fn=prandom_reseed ### ### INITCALL END: level=7 fn=prandom_reseed ret=0 ### ### INITCALL BEGIN: level=7 fn=clk_debug_init ### ### INITCALL END: level=7 fn=clk_debug_init ret=0 ### ### INITCALL BEGIN: level=7 fn=sync_state_resume_initcall ### ### INITCALL END: level=7 fn=sync_state_resume_initcall ret=0 ### ### INITCALL BEGIN: level=7 fn=deferred_probe_initcall ### ### INITCALL END: level=7 fn=deferred_probe_initcall ret=0 ### ### INITCALL BEGIN: level=7 fn=ubi_init ### ### INITCALL END: level=7 fn=ubi_init ret=0 ### ### INITCALL BEGIN: level=7 fn=of_fdt_raw_init ### ### INITCALL END: level=7 fn=of_fdt_raw_init ret=0 ### ### INITCALL BEGIN: level=7 fn=clk_disable_unused ###
忽略CLK錯誤檢查
chosen {
bootargs = "console=ttyS4,115200n8 earlycon=sbi ignore_loglevel loglevel=8 init=/init clk_ignore_unused";
};
終於進入載入init的階段，這才是Kernel完成開機的階段，當然中間忽略的問題還要一一找出來
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) CPU: 0 PID: 1 Comm: swapper Not tainted 5.4.61 #5 Call Trace: [<ffffffe0000211c4>] walk_stackframe+0x0/0x98 [<ffffffe00002137c>] show_stack+0x2a/0x34 [<ffffffe000287892>] dump_stack+0x20/0x28 [<ffffffe000025882>] panic+0xec/0x27a [<ffffffe000000f22>] mount_block_root+0x214/0x27a [<ffffffe00000110a>] mount_root+0x86/0x90 [<ffffffe000001288>] prepare_namespace+0x174/0x17e [<ffffffe000000b62>] kernel_init_freeable+0x174/0x1c8 [<ffffffe000297ff8>] kernel_init+0x12/0xee [<ffffffe00001ff30>] ret_from_exception+0x0/0xc ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]---
移除CLK錯誤檢查
chosen {
bootargs = "console=ttyS4,115200n8 earlycon=sbi ignore_loglevel loglevel=8 init=/init";
};
在CLK裡面添加Debug Log
1230 static void clk_disable_unused_subtree(struct clk_core *core)
1231 {
1232 struct clk_core *child;
1233 unsigned long flags;
1234
1235 printk(
1236 "CLK %s: prepare=%d enable=%d protect=%d parent=%s\n",
1237 core->name,
1238 core->prepare_count,
1239 core->enable_count,
1240 core->protect_count,
1241 core->parent ? core->parent->name : "NULL");
定位到PLL-CPU問題
### CLK UNUSED END: pll-ddr0 ### CLK pll-cpux: prepare=0 enable=0 protect=0 parent=dcxo24M CLK riscv: prepare=0 enable=0 protect=0 parent=pll-cpux CLK riscv-axi: prepare=0 enable=0 protect=0 parent=riscv ### CLK UNUSED END: riscv-axi ### ### CLK UNUSED END: riscv ### CLK pll-cpux-div: prepare=0 enable=0 protect=0 parent=pll-cpux ### CLK UNUSED END: pll-cpux-div ###
將SUN8IW20_PLL_CPUX_REG設定成CLK_IS_CRITICAL
$ vim drivers/clk/sunxi-ng/ccu-sun8iw20.c
37 #define SUN8IW20_PLL_CPUX_REG 0x000
38 static struct ccu_mult pll_cpux_clk = {
39 .enable = BIT(27),
40 .lock = BIT(28),
41 .mult = _SUNXI_CCU_MULT_MIN(8, 8, 12),
42 .common = {
43 .reg = 0x000,
44 .hw.init = CLK_HW_INIT("pll-cpux", "dcxo24M",
45 &ccu_mult_ops,
46 CLK_SET_RATE_UNGATE | CLK_IS_CRITICAL),
47 },
48 };
添加BOOT開機選項，然後使用rootwait故意讓Kernel停在等待rootfs Ready的狀態
chosen {
bootargs = "console=ttyS4,115200n8 earlycon=sbi ignore_loglevel loglevel=8 root=/dev/mmcblk0p1 rootwait rw rootfstype=fat init=/init";
};
Kernel已經可以正常開機
printk: console [ttyS4] enabled printk: bootconsole [sbi0] disabled printk: bootconsole [sbi0] disabled misc dump reg init brd: module loaded loop: module loaded i2c /dev entries driver ashmem: initialized Waiting for root device /dev/mmcblk0p1...