iMX6SX RMII kernel freeze issue

texnikk — Fri, 10 Sep 2021 09:43:45 GMT

Hello,

We've been trying to connect FEC1 of iMX6SX with DP83640 in RMII mode.

We're using external 50MHz generator to supply both FEC and PHY with REF_CLK.

Following changes to clk-imx6sx.c:

+imx_clk_set_rate(clks[IMX6SX_CLK_ENET_REF], 50000000);

IOMUXC_GPR_GPR1 bits are:

ENET1_CLK_SEL = "1",

ENET1_TX_CLK_DIR = "0"

SION bit is set:

#define MX6SX_PAD_ENET1_TX_CLK__ENET1_REF_CLK1 0x0090 0x03D8 0x0760 0x11 0x1

Device tree:

&fec1 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_enet1_rmii>; phy-supply = <&reg_enet_3v3>; phy-mode = "rmii"; phy-handle = <&ethphy1>; phy-reset-gpios = <&gpio2 1 GPIO_ACTIVE_LOW>; status = "okay"; mdio { #address-cells = <1>; #size-cells = <0>; ethphy1: ethernet-phy@1 { reg = <1>; max-speed = <100>; interrupt-parent = <&gpio2>; interrupts = <0 IRQ_TYPE_LEVEL_LOW>; }; }; }; &iomuxc { imx6sx { pinctrl_enet1_rmii: enet1rmiigrp { fsl,pins = <MX6SX_PAD_ENET1_CRS__GPIO2_IO_1 0xa0b1>, //RST <MX6SX_PAD_ENET1_MDC__ENET1_MDC 0xa088>, <MX6SX_PAD_ENET1_MDIO__ENET1_MDIO 0xa088>, <MX6SX_PAD_RGMII1_TD0__ENET1_TX_DATA_0 0xa088>, <MX6SX_PAD_RGMII1_TD1__ENET1_TX_DATA_1 0xa088>, <MX6SX_PAD_RGMII1_TX_CTL__ENET1_TX_EN 0xa088>, //<MX6SX_PAD_ENET1_TX_CLK__ENET1_REF_CLK1 0x10f9>, <MX6SX_PAD_ENET1_TX_CLK__ENET1_REF_CLK1 0x30C1>, <MX6SX_PAD_ENET1_COL__GPIO2_IO_0 0x3081>, // INT <MX6SX_PAD_RGMII1_RD0__ENET1_RX_DATA_0 0x3081>, <MX6SX_PAD_RGMII1_RD1__ENET1_RX_DATA_1 0x3081>, <MX6SX_PAD_RGMII1_RX_CTL__ENET1_RX_EN 0x3081>; // ->CRS/CRS_DV }; }; };

The problem is that when kernel is starting, it hangs on following lines:

[ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.9.11-VenOS (root@f8558289a7eb) (gcc version 7.4.1 20181213 [linaro-7.4-2019.02 revision 56ec6f6b99cc167ff0c2f8e1a2eed33b1ed c85d4] (Linaro GCC 7.4-2019.02) ) #1 SMP PREEMPT Fri Sep 10 09:19:07 UTC 2021 [ 0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] OF: fdt:Machine model: DC500 [ 0.000000] Reserved memory: created CMA memory pool at 0x98000000, size 64 MiB [ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] percpu: Embedded 13 pages/cpu @9fbaf000 s21580 r8192 d23476 u53248 [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 130048 [ 0.000000] Kernel command line: mtdparts=gpmi-nand:2m(boot),1m(env),509m(data) video=fb_lcd panic=1 console=ttymxc0,115200 ubi.mtd=2 root=ubi0:boot1 r o noatime rootfstype=ubifs init=/launcher [ 0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes) [ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes) [ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes) [ 0.000000] Memory: 445104K/524288K available (5120K kernel code, 189K rwdata, 1624K rodata, 1024K init, 392K bss, 13648K reserved, 65536K cma-reserved , 0K highmem) [ 0.000000] Virtual kernel memory layout: [ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB) [ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB) [ 0.000000] vmalloc : 0xa0800000 - 0xff800000 (1520 MB) [ 0.000000] lowmem : 0x80000000 - 0xa0000000 ( 512 MB) [ 0.000000] pkmap : 0x7fe00000 - 0x80000000 ( 2 MB) [ 0.000000] modules : 0x7f000000 - 0x7fe00000 ( 14 MB) [ 0.000000] .text : 0x80008000 - 0x80600000 (6112 kB) [ 0.000000] .init : 0x80800000 - 0x80900000 (1024 kB) [ 0.000000] .data : 0x80900000 - 0x8092f6c0 ( 190 kB) [ 0.000000] .bss : 0x80931000 - 0x809932b4 ( 393 kB) [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 [ 0.000000] Preemptible hierarchical RCU implementation. [ 0.000000] Build-time adjustment of leaf fanout to 32. [ 0.000000] RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=1. [ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=32, nr_cpu_ids=1 [ 0.000000] NR_IRQS:16 nr_irqs:16 16 [ 0.000000] L2C-310 erratum 769419 enabled [ 0.000000] L2C-310 enabling early BRESP for Cortex-A9 [ 0.000000] L2C-310 full line of zeros enabled for Cortex-A9 [ 0.000000] L2C-310 ID prefetch enabled, offset 16 lines [ 0.000000] L2C-310 dynamic clock gating enabled, standby mode enabled [ 0.000000] L2C-310 cache controller enabled, 16 ways, 256 kB [ 0.000000] L2C-310: CACHE_ID 0x410000c8, AUX_CTRL 0x76430001 [ 0.000000] Switching to timer-based delay loop, resolution 333ns [ 0.000007] sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 715827882841ns [ 0.000025] clocksource: mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 637086815595 ns [ 0.001670] Console: colour dummy device 80x30 [ 0.001691] Calibrating delay loop (skipped), value calculated using timer frequency.. 6.00 BogoMIPS (lpj=30000) [ 0.001706] pid_max: default: 32768 minimum: 301 [ 0.001803] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.001814] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.002444] CPU: Testing write buffer coherency: ok [ 0.002740] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000 [ 0.002784] Setting up static identity map for 0x80100000 - 0x80100058 [ 0.100359] Brought up 1 CPUs [ 0.100376] SMP: Total of 1 processors activated (6.00 BogoMIPS). [ 0.100384] CPU: All CPU(s) started in SVC mode. [ 0.101177] devtmpfs: initialized [ 0.109899] VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4 [ 0.110243] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 0.113940] pinctrl core: initialized pinctrl subsystem [ 0.114946] NET: Registered protocol family 16 [ 0.121762] DMA: preallocated 256 KiB pool for atomic coherent allocations [ 0.150617] cpuidle: using governor menu [ 0.171441] setting gpr mode 1 [ 0.171764] hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers. [ 0.171776] hw-breakpoint: maximum watchpoint size is 4 bytes. [ 0.172367] imx6sx-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver [ 0.173493] imx-gpc 20dc000.gpc: Registered imx-gpc [ 0.174209] MU is ready for cross core communication! [ 0.254907] mxs-dma 1804000.dma-apbh: initialized [ 0.258177] i2c i2c-1: IMX I2C adapter registered [ 0.258200] i2c i2c-1: can't use DMA, using PIO instead. [ 0.258846] i2c i2c-2: IMX I2C adapter registered [ 0.258867] i2c i2c-2: can't use DMA, using PIO instead. [ 0.259059] pps_core: LinuxPPS API ver. 1 registered [ 0.259069] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it> [ 0.259094] PTP clock support registered [ 0.260302] imx rpmsg driver is registered. [ 0.271332] clocksource: Switched to clocksource mxc_timer1 [ 0.281578] NET: Registered protocol family 2 [ 0.282175] TCP established hash table entries: 4096 (order: 2, 16384 bytes) [ 0.282226] TCP bind hash table entries: 4096 (order: 3, 32768 bytes) [ 0.282296] TCP: Hash tables configured (established 4096 bind 4096) [ 0.282364] UDP hash table entries: 256 (order: 1, 8192 bytes) [ 0.282393] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes) [ 0.282567] NET: Registered protocol family 1 [ 0.283178] hw perfevents: enabled with armv7_cortex_a9 PMU driver, 7 counters available [ 0.284796] Bus freq driver module loaded [ 0.285542] futex hash table entries: 256 (order: 2, 16384 bytes) [ 0.296458] workingset: timestamp_bits=30 max_order=17 bucket_order=0 [ 0.302225] squashfs: version 4.0 (2009/01/31) Phillip Lougher [ 0.309516] io scheduler noop registered [ 0.309532] io scheduler deadline registered [ 0.309743] io scheduler cfq registered (default) [ 0.432877] mxsfb 2220000.lcdif: failed to find mxc display driver [ 0.434932] mxsfb 2220000.lcdif: Unable to allocate overlay fb memory [ 0.434947] mxsfb 2220000.lcdif: failed to map video mem for overlay [ 0.435139] mxsfb 2220000.lcdif: initialized [ 0.436442] imx-sdma 20ec000.sdma: no iram assigned, using external mem [ 0.439460] imx-sdma 20ec000.sdma: loaded firmware 3.3 [ 0.445638] 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 23, base_baud = 5000000) is a IMX [ 1.052160] console [ttymxc0] enabled [ 1.056663] 21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 63, base_baud = 5000000) is a IMX [ 1.066038] 21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 64, base_baud = 5000000) is a IMX [ 1.075382] 21f0000.serial: ttymxc3 at MMIO 0x21f0000 (irq = 65, base_baud = 5000000) is a IMX [ 1.084751] 21f4000.serial: ttymxc4 at MMIO 0x21f4000 (irq = 66, base_baud = 5000000) is a IMX [ 1.094131] 22a0000.serial: ttymxc5 at MMIO 0x22a0000 (irq = 71, base_baud = 5000000) is a IMX [ 1.103772] imx sema4 driver is registered. [ 1.108021] [drm] Initialized [ 1.111565] [drm] Initialized vivante 1.0.0 20120216 on minor 0 [ 1.128664] loop: module loaded [ 1.136940] random: fast init done [ 1.142607] nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xdc [ 1.148968] nand: Macronix MX30LF4G28AC [ 1.152842] nand: 512 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 112 [ 1.160851] gpmi-nand 1806000.gpmi-nand: mode:5 ,failed in set feature. [ 1.168424] Bad block table not found for chip 0 [ 1.173915] Bad block table not found for chip 0 [ 1.178538] Scanning device for bad blocks [ 1.472686] Bad eraseblock 2989 at 0x0000175a0000 [ 1.556505] Bad eraseblock 3810 at 0x00001dc40000 [ 1.590755] Bad block table written to 0x00001ffe0000, version 0x01 [ 1.598516] Bad block table written to 0x00001ffc0000, version 0x01 [ 1.604846] 3 cmdlinepart partitions found on MTD device gpmi-nand [ 1.611033] Creating 3 MTD partitions on "gpmi-nand": [ 1.616119] 0x000000000000-0x000000200000 : "boot" [ 1.632274] 0x000000200000-0x000000300000 : "env" [ 1.648275] 0x000000300000-0x000020000000 : "data" [ 1.670072] gpmi-nand 1806000.gpmi-nand: driver registered. [ 1.677618] libphy: Fixed MDIO Bus: probed [ 1.685330] pps pps0: new PPS source ptp0 [ 1.694736] libphy: fec_enet_mii_bus: probed [ 1.710467] fec 2188000.ethernet eth0: registered PHC device 0 [ 1.717585] input: 20cc000.snvs:snvs-powerkey as /devices/soc0/soc/2000000.aips-bus/20cc000.snvs/20cc000.snvs:snvs-powerkey/input/input0 [ 1.730829] input: fts_ts as /devices/soc0/soc/2100000.aips-bus/21a4000.i2c/i2c-1/1-0038/input/input1 [ 1.994095] rtc-pcf85063 2-0051: rtc core: registered rtc-pcf85063 as rtc0 [ 2.001709] snvs_rtc 20cc000.snvs:snvs-rtc-lp: rtc core: registered 20cc000.snvs:snvs-r as rtc1 [ 2.010570] i2c /dev entries driver [ 2.016033] imx2-wdt 20bc000.wdog: timeout 60 sec (nowayout=0) [ 2.022927] sdhci: Secure Digital Host Controller Interface driver [ 2.029118] sdhci: Copyright(c) Pierre Ossman [ 2.033537] sdhci-pltfm: SDHCI platform and OF driver helper [ 2.040259] sdhci-esdhc-imx 2198000.usdhc: allocated mmc-pwrseq [ 2.111397] mmc2: SDHCI controller on 2198000.usdhc [2198000.usdhc] using ADMA [ 2.142322] mmc2: queuing unknown CIS tuple 0x80 (2 bytes) [ 2.149538] mmc2: queuing unknown CIS tuple 0x80 (3 bytes) [ 2.156737] mmc2: queuing unknown CIS tuple 0x80 (3 bytes) [ 2.167375] mmc2: queuing unknown CIS tuple 0x80 (7 bytes) [ 2.174607] mmc2: queuing unknown CIS tuple 0x80 (3 bytes) [ 2.182808] mmc2: queuing unknown CIS tuple 0x80 (6 bytes) [ 2.191358] mmc3: SDHCI controller on 219c000.usdhc [219c000.usdhc] using ADMA [ 2.201297] NET: Registered protocol family 26 [ 2.206035] NET: Registered protocol family 17 [ 2.210560] 8021q: 802.1Q VLAN Support v1.8 [ 2.225049] cpu cpu0: dev_pm_opp_get_opp_count: OPP table not found (-19) [ 2.234267] cpu cpu0: Registered imx6q-cpufreq [ 2.265262] imx_thermal 2000000.aips-bus:tempmon: Extended Commercial CPU temperature grade - max:105C critical:100C passive:95C [ 2.277486] ubi0: attaching mtd2 [ 2.299954] random: crng init done [ 2.398177] mmc2: new high speed SDIO card at address 0001 [ 4.338619] ubi0: scanning is finished [ 4.368853] ubi0: attached mtd2 (name "data", size 509 MiB) [ 4.374594] ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes [ 4.381533] ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 2048 [ 4.388338] ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096 [ 4.395347] ubi0: good PEBs: 4066, bad PEBs: 6, corrupted PEBs: 0 [ 4.401487] ubi0: user volume: 5, internal volumes: 1, max. volumes count: 128 [ 4.408729] ubi0: max/mean erase counter: 1/0, WL threshold: 4096, image sequence number: 850540274 [ 4.417918] ubi0: available PEBs: 171, total reserved PEBs: 3895, PEBs reserved for bad PEB handling: 74 [ 4.427484] ubi0: background thread "ubi_bgt0d" started, PID 81 [ 4.435298] input: gpio-inputs as /devices/soc0/gpio-inputs/input/input2 [ 4.444157] rtc-pcf85063 2-0051: setting system clock to 2021-09-10 04:27:10 UTC (1631248030)

But if we disconnect 50MHz generator from MX6SX_PAD_ENET1_TX_CLK__ENET1_REF_CLK1 of iMX6, kernel continues to boot normally!

Could you please help solving this issue?

Thanks

Re: iMX6SX RMII kernel freeze issue

texnikk — Fri, 10 Sep 2021 09:45:13 GMT

Here is log of continued boot:

[ 4.435298] input: gpio-inputs as /devices/soc0/gpio-inputs/input/input2 [ 4.444157] rtc-pcf85063 2-0051: setting system clock to 2021-09-10 04:27:10 UTC (1631248030) ?[ 1043.965087] UBIFS (ubi0:3): UBIFS: mounted UBI device 0, volume 3, name "boot1", R/O mode [ 1043.973325] UBIFS (ubi0:3): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 1043.983268] UBIFS (ubi0:3): FS size: 217636864 bytes (207 MiB, 1714 LEBs), journal size 10919936 bytes (10 MiB, 86 LEBs) [ 1043.994205] UBIFS (ubi0:3): reserved for root: 4952683 bytes (4836 KiB) [ 1044.002954] UBIFS (ubi0:3): media format: w4/r0 (latest is w4/r0), UUID 12885A88-0B42-4A8E-B319-D10178ACB240, small LPT model [ 1044.027415] VFS: Mounted root (ubifs filesystem) readonly on device 0:12. [ 1044.037133] devtmpfs: mounted [ 1044.045336] Freeing unused kernel memory: 1024K (80800000 - 80900000) [ 1044.369208] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 84 [ 1044.447424] UBIFS (ubi0:1): recovery needed [ 1044.771026] UBIFS (ubi0:1): recovery completed [ 1044.775970] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "log" [ 1044.783178] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 1044.793150] UBIFS (ubi0:1): FS size: 9269248 bytes (8 MiB, 73 LEBs), journal size 1015809 bytes (0 MiB, 6 LEBs) [ 1044.803344] UBIFS (ubi0:1): reserved for root: 437809 bytes (427 KiB) [ 1044.809812] UBIFS (ubi0:1): media format: w4/r0 (latest is w4/r0), UUID C67164B9-5E1C-4DF9-8038-092EAC75E679, small LPT model [ 1046.362216] cgroup: cgroup2: unknown option "nsdelegate" [ 1046.402149] systemd[1]: systemd 240 running in system mode. (-PAM -AUDIT -SELINUX -IMA -APPARMOR -SMACK +SYSVINIT +UTMP -LIBCRYPTSETUP -GCRYPT -GNUTLS -ACL -XZ -LZ4 -SECCOMP +BLKID -ELFUTILS +KMOD -IDN2 -IDN -PCRE2 default-hierarchy=hybrid) [ 1046.424179] systemd[1]: Detected architecture arm.

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iMX6SX RMII kernel freeze issue

Re: iMX6SX RMII kernel freeze issue