[参考译文] AM3359：捕捉到<SEGV>当 DISCO&#39；s 系统启动时

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https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1158936/am3359-caught-segv-when-distro-s-systemd-starting

器件型号：AM3359
主题中讨论的其他器件：TPS51200

大家好、

第一次在论坛上发帖、我将尽最大努力让这篇文章成为一篇很好的文章。

我们已经使用 TI AM335x-ICEV2板一段时间来开发我们的嵌入式 Linux 应用和我们
我们自己的定制电路板设计。经过大量的调试和读取、我们能够正确加载 U-Boot、然后再加载
我们继续使用非常基本的 FDT 加载内核。

器件： AM3359BZCZ
存储器： MT41J128M16JT

我们在尝试加载文件系统时遇到问题。我们尝试加载 Arago 和 Debian (两者都在 ICEV2板上工作)
我们开始遇到奇怪的问题。最经常发生的是在使用 Debian 时在系统初始化脚本(生成器)中重复使用 SEGV
一个简单的"被捕获" ，将核心转储为 pid 65。冻结执行。" 从 TI Linux SDK 07.03.00.005中提供的基本文件系统加载 Arago 时。

我们遵循完整的板端口(https://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/How_to_Guides_Board_Port.html)序列。
第一个理论是、FDT (.dTB)可能缺少关键组件、但即使在 ICEV2板上、我也可以将 AM335x-icev2.DTS 简化为简单的
UART + MMC 初始化和分发仍可以立即运行。我离 Linux 专家还很远、因此必须深入了解 U-Boot +内核
但是、使用分发和 systemd、我已经达到了一点、我不知道接下来要做什么。

从类似的帖子(https://e2e.ti.com/support/processors-group/processors/f/processors-forum/316533/linux-boot-freezing-on-custom-board)中、我怀疑存在硬件问题
尽管我确实验证了 PMIC 是否提供了正确的电压、即使我们没有主动控制它。

这可能是 DDR3问题吗？我是否可以运行任何测试来验证 DDR3的完整性和耐用性？它运行 SPL + Uboot +内核时不会出现任何问题、因此我的理解是这样
DDR3运行正常。 (甚至可以通过 JTAG 和 CCS 读取/写入整个地址范围)。

这是我的内核引导+ Distro 引导的日志。

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.4.106-g023faefa70 (oe-user@oe-host) (gcc version 9.2.1 20191025 (GNU T
oolchain for the A-profile Architecture 9.2-2019.12 (arm-9.10))) #1 PREEMPT Mon May 24 09:04:10 UTC 2
021
[    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: AM335x HELLO
[    0.000000] Memory policy: Data cache writeback
[    0.000000] efi: Getting EFI parameters from FDT:
[    0.000000] efi: UEFI not found.
[    0.000000] cma: Reserved 48 MiB at 0x8a800000
[    0.000000] CPU: All CPU(s) started in SVC mode.
[    0.000000] AM335X ES2.1 (sgx neon)
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 64706
[    0.000000] Kernel command line: console=ttyO1,115200n8 root=PARTUUID=d869d71e-01 rw rootfstype=ex
t4 rootwait
[    0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes, linear)
[    0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes, linear)
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 194208K/261120K available (9216K kernel code, 295K rwdata, 3092K rodata, 1024K
 init, 254K bss, 17760K reserved, 49152K cma-reserved, 0K highmem)
[    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: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] IRQ: Found an INTC at 0x(ptrval) (revision 5.0) with 128 interrupts
[    0.000000] random: get_random_bytes called from start_kernel+0x2b4/0x470 with crng_init=0
[    0.000000] OMAP clockevent source: timer2 at 24000000 Hz
[    0.000020] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[    0.000047] clocksource: timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949
 ns
[    0.000060] OMAP clocksource: timer1 at 24000000 Hz
[    0.000378] timer_probe: no matching timers found
[    0.000606] Console: colour dummy device 80x30
[    0.000647] WARNING: Your 'console=ttyO1' has been replaced by 'ttyS1'
[    0.000655] This ensures that you still see kernel messages. Please
[    0.000661] update your kernel commandline.
[    0.000719] Calibrating delay loop... 597.60 BogoMIPS (lpj=2988032)
[    0.058759] pid_max: default: 32768 minimum: 301
[    0.059056] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.059076] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.060207] CPU: Testing write buffer coherency: ok
[    0.060288] CPU0: Spectre v2: using BPIALL workaround
[    0.061334] Setting up static identity map for 0x80100000 - 0x80100060
[    0.061527] rcu: Hierarchical SRCU implementation.
[    0.061634] EFI services will not be available.
[    0.062091] devtmpfs: initialized
[    0.075689] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[    0.076187] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446
2750000 ns
[    0.076219] futex hash table entries: 256 (order: -1, 3072 bytes, linear)
[    0.081151] pinctrl core: initialized pinctrl subsystem
[    0.082137] DMI not present or invalid.
[    0.082723] NET: Registered protocol family 16
[    0.085759] DMA: preallocated 256 KiB pool for atomic coherent allocations
[    0.114183] l3-aon-clkctrl:0000:0: failed to disable
[    0.116761] cpuidle: using governor ladder
[    0.116807] cpuidle: using governor menu
[    0.139831] No ATAGs?
[    0.139845] hw-breakpoint: debug architecture 0x4 unsupported.
[    0.161882] debugfs: Directory '49000000.edma' with parent 'dmaengine' already present!
[    0.161926] edma 49000000.edma: TI EDMA DMA engine driver
[    0.164737] iommu: Default domain type: Translated 
[    0.167500] SCSI subsystem initialized
[    0.168115] mc: Linux media interface: v0.10
[    0.168169] videodev: Linux video capture interface: v2.00
[    0.168289] pps_core: LinuxPPS API ver. 1 registered
[    0.168300] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.i
t>
[    0.168328] PTP clock support registered
[    0.168375] EDAC MC: Ver: 3.0.0
[    0.170291] Advanced Linux Sound Architecture Driver Initialized.
[    0.171833] clocksource: Switched to clocksource timer1
[    0.182815] thermal_sys: Registered thermal governor 'fair_share'
[    0.182826] thermal_sys: Registered thermal governor 'bang_bang'
[    0.182847] thermal_sys: Registered thermal governor 'step_wise'
[    0.182856] thermal_sys: Registered thermal governor 'user_space'
[    0.182864] thermal_sys: Registered thermal governor 'power_allocator'
[    0.183528] NET: Registered protocol family 2
[    0.184495] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes, linear)
[    0.184536] TCP established hash table entries: 2048 (order: 1, 8192 bytes, linear)
[    0.184575] TCP bind hash table entries: 2048 (order: 1, 8192 bytes, linear)
[    0.184610] TCP: Hash tables configured (established 2048 bind 2048)
[    0.184741] UDP hash table entries: 256 (order: 0, 4096 bytes, linear)
[    0.184767] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes, linear)
[    0.184969] NET: Registered protocol family 1
[    0.185700] RPC: Registered named UNIX socket transport module.
[    0.185718] RPC: Registered udp transport module.
[    0.185726] RPC: Registered tcp transport module.
[    0.185734] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.185753] PCI: CLS 0 bytes, default 64
[    0.186903] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available
[    0.188527] Initialise system trusted keyrings
[    0.188918] workingset: timestamp_bits=14 max_order=16 bucket_order=2
[    0.196030] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.197037] NFS: Registering the id_resolver key type
[    0.197090] Key type id_resolver registered
[    0.197100] Key type id_legacy registered
[    0.197159] ntfs: driver 2.1.32 [Flags: R/O].
[    0.198081] Key type asymmetric registered
[    0.198101] Asymmetric key parser 'x509' registered
[    0.198168] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 244)
[    0.198182] io scheduler mq-deadline registered
[    0.198192] io scheduler kyber registered
[    0.205293] OMAP GPIO hardware version 0.1
[    0.247954] omap-mailbox 480c8000.mailbox: omap mailbox rev 0x400
[    0.275645] pinctrl-single 44e10800.pinmux: 142 pins, size 568
[    0.346474] Serial: 8250/16550 driver, 10 ports, IRQ sharing enabled
[    0.352501] 48022000.serial: ttyS1 at MMIO 0x48022000 (irq = 33, base_baud = 3000000) is a 8250
[    0.964411] printk: console [ttyS1] enabled
[    0.972076] omap_rng 48310000.rng: Random Number Generator ver. 20
[    0.982020] random: fast init done
[    0.985750] random: crng init done
[    1.008286] brd: module loaded
[    1.020696] loop: module loaded
[    1.030295] libphy: Fixed MDIO Bus: probed
[    1.038346] i2c /dev entries driver
[    1.046344] cpuidle: enable-method property 'ti,am3352' found operations
[    1.054166] sdhci: Secure Digital Host Controller Interface driver
[    1.060382] sdhci: Copyright(c) Pierre Ossman
[    1.093327] omap_hsmmc 47810000.mmc: RX DMA channel request failed
[    1.103449] sdhci-pltfm: SDHCI platform and OF driver helper
[    1.111222] ledtrig-cpu: registered to indicate activity on CPUs
[    1.122986] NET: Registered protocol family 10
[    1.128582] Segment Routing with IPv6
[    1.132505] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[    1.139331] NET: Registered protocol family 17
[    1.144293] Key type dns_resolver registered
[    1.148737] omap_voltage_late_init: Voltage driver support not added
[    1.155949] Loading compiled-in X.509 certificates
[    1.176713] hctosys: unable to open rtc device (rtc0)
[    1.181944] mmc0: host does not support reading read-only switch, assuming write-enable
[    1.190810] ALSA device list:
[    1.193986]   No soundcards found.
[    1.198177] mmc0: new high speed SDHC card at address e624
[    1.204013] Waiting for root device PARTUUID=d869d71e-01...
[    1.210454] mmcblk0: mmc0:e624 SU32G 29.7 GiB 
[    1.217278]  mmcblk0: p1
[    1.284382] EXT4-fs (mmcblk0p1): recovery complete
[    1.292810] EXT4-fs (mmcblk0p1): mounted filesystem with ordered data mode. Opts: (null)
[    1.301041] VFS: Mounted root (ext4 filesystem) on device 179:1.
[    1.309354] devtmpfs: mounted
[    1.314506] Freeing unused kernel memory: 1024K
[    1.319700] Run /sbin/init as init process
[    1.656618] systemd[1]: System time before build time, advancing clock.
[    1.713214] systemd[1]: systemd 244.5+ running in system mode. (+PAM -AUDIT -SELINUX +IMA -APPARMO
R -SMACK +SYSVINIT +UTMP -LIBCRYPTSETUP -GCRYPT -GNUTLS +ACL +XZ -LZ4 -SECCOMP +BLKID -ELFUTILS +KMOD
 -IDN2 -IDN -PCRE2 default-hierarchy=hybrid)
[    1.735854] systemd[1]: Detected architecture arm.

Welcome to Arago 2020.09!

[    1.783609] systemd[1]: Set hostname to <am335x-evm>.
[    1.801568] systemd[1]: Initializing machine ID from random generator.
[    3.147485] systemd[1]: Caught <SEGV>, dumped core as pid 65.
[    3.153741] systemd[1]: Freezing execution.
[   31.201943] vbat: disabling

感谢您的帮助、如果我能提供更多信息、敬请告知。

注：我们的定制板具有多个外设、但我目前正在尝试将其保持在一个简单的 UART + MMC 中、并将在系统稳定时集成每个外设。

这是我的.dts

/*
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
/dts-v1/;

#include "am33xx.dtsi"

/ {
	model = "AM335x HELLO";
	compatible = "ti,am335x-hello", "ti,am33xx";

	chosen {
		stdout-path = &uart3;
		tick-timer = &timer2;
	};

	memory {
		device_type = "memory";
		reg = <0x80000000 0x10000000>; /* 256 MB */
	};

	vbat: fixedregulator@0 {
		compatible = "regulator-fixed";
		regulator-name = "vbat";
		regulator-min-microvolt = <5000000>;
		regulator-max-microvolt = <5000000>;
		regulator-boot-on;
	};

	vmmc: fixedregulator@1 {
		compatible = "regulator-fixed";
		regulator-name = "vmmc";
		regulator-min-microvolt = <3300000>;
		regulator-max-microvolt = <3300000>;
		regulator-always-on;
		regulator-boot-on;
	};
};

&am33xx_pinmux {
	mmc0_pins_default: mmc0_pins_default {
		pinctrl-single,pins = <
			AM33XX_PADCONF(AM335X_PIN_MMC0_DAT3, PIN_INPUT_PULLUP, MUX_MODE0)
			AM33XX_PADCONF(AM335X_PIN_MMC0_DAT2, PIN_INPUT_PULLUP, MUX_MODE0)
			AM33XX_PADCONF(AM335X_PIN_MMC0_DAT1, PIN_INPUT_PULLUP, MUX_MODE0)
			AM33XX_PADCONF(AM335X_PIN_MMC0_DAT0, PIN_INPUT_PULLUP, MUX_MODE0)
			AM33XX_PADCONF(AM335X_PIN_MMC0_CLK, PIN_INPUT_PULLUP, MUX_MODE0)
			AM33XX_PADCONF(AM335X_PIN_MMC0_CMD, PIN_INPUT_PULLUP, MUX_MODE0)
		>;
	};

	uart1_pins: uart1_pins {
		pinctrl-single,pins = <
			0x180 (PIN_INPUT_PULLUP | MUX_MODE0)	/* uart1_rxd.uart1_rxd */
			0x184 (PIN_OUTPUT_PULLDOWN | MUX_MODE0)	/* uart1_txd.uart1_txd */
		>;
	};
};

&uart1 {
	pinctrl-names = "default";
	pinctrl-0 = <&uart1_pins>;
	status = "okay";
};

&mmc1 {
	status = "okay";
	vmmc-supply = <&vmmc>;
	bus-width = <4>;
	pinctrl-names = "default";
	pinctrl-0 = <&mmc0_pins_default>;
};

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[参考译文] AM3359：捕捉到<SEGV>当 DISCO&#39；s 系统启动时