Loading the M4 in DDR (memory conflict)

finncarlsvi · ‎01-21-2016

Hello,

I'm using the Boundary Devices Nitrogen 6SoloX board, which, out of the box loads the M4 into OCRAM (address 0x09000000). Unfortunately, OCRAM is restricted to 128kB and so I looked at loading the M4 binary into DDR (address 0x80000000).

I followed the guide "How to Run the MQX™ RTOS on Various RAM Memories for i.MX 6SoloX":

http://cache.nxp.com/files/microcontrollers/doc/app_note/AN5127.pdf

Configuring u-boot, the kernel, and MQX was fairly straight forward and I completed every step in the process.

MQX

MEMORY

{

text (RX): ORIGIN = 0x80000000, LENGTH = 0x00800000 /* DDR */

data (RW): ORIGIN = 0x20000000, LENGTH = 0x00007E00 /* TCMU */

}

U-Boot

#define PHYS_SDRAM (MMDC0_ARB_BASE_ADDR + SZ_16M) // i.e. 0x81000000

#define PHYS_SDRAM_SIZE (SZ_1G - SZ_16M)

6x_bootscript

I also had to change the "6x_bootscript" that is used to load Linux from u-boot:

a_script=0x81008000

a_zImage=0x81008000

a_fdt=0x83000000

a_ramdisk=0x83800000

a_initrd=0x83a00000

The M4 loads without issue and Linux also loads without any problems. My issue is that at some point during Linux booting, the M4 sometimes hangs, or gives garbled output before hanging.

My boot messages are

U-Boot 2015.07 (Jan 20 2016 - 11:40:57 -0800)

CPU: Freescale i.MX6SX rev1.2 996 MHz (running at 792 MHz)

Reset cause: POR

Board: Nitrogen6sx

I2C: ready

DRAM: 1008 MiB

MMC: FSL_SDHC: 0, FSL_SDHC: 1

SF: Detected SST25VF016B with page size 256 Bytes, erase size 4 KiB, total 2 MiB

In: serial

Out: serial

Err: serial

Net: using phy at 4

using phy at 5

FEC0 [PRIME], FEC1, usb_ether

Error: usb_ether address not set.

Hit any key to stop autoboot: 1 0

switch to partitions #0, OK

mmc0 is current device

reading /6x_bootscript

3632 bytes read in 14 ms (252.9 KiB/s)

## Executing script at 80008000

reading m4_ddr.bin

** Unable to read file m4_ddr.bin **

## Starting auxiliary core at 0x80000000 ...

reading uEnv.txt

** Unable to read file uEnv.txt **

reading /imx6sx-nitrogen6sx-m4.dtb

44936 bytes read in 20 ms (2.1 MiB/s)

Setting bus to 1

Error writing the chip: -19

reading /zImage

5001552 bytes read in 234 ms (20.4 MiB/s)

Kernel image @ 0x81008000 [ 0x000000 - 0x4c5150 ]

## Flattened Device Tree blob at 83000000

Booting using the fdt blob at 0x83000000

reserving fdt memory region: addr=83000000 size=b000

Using Device Tree in place at 83000000, end 8300dfff

Starting kernel ...

Booting Linux on physical CPU 0x0

Initializing cgroup subsys cpu

Linux version 3.14.38-prenav+yocto+g4af577c (prenav@prenav-finn) (gcc version 5.3.0 (GCC) ) #4 SMP PREEMPT Wed Jan 20 12:02:18 PST 2016

CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c5387d

CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache

Machine model: Freescale i.MX6 SoloX Nitrogen6sx Board

cma: CMA: reserved 320 MiB at aa000000

Memory policy: Data cache writealloc

PERCPU: Embedded 7 pages/cpu @c063a000 s8192 r8192 d12288 u32768

Built 1 zonelists in Zone order, mobility grouping on. Total pages: 255778

Kernel command line: console=ttymxc0,115200 vmalloc=400M consoleblank=0 rootwait fixrtc root=/dev/mmcblk0p2

PID hash table entries: 4096 (order: 2, 16384 bytes)

Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)

Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)

Memory: 684104K/1031168K available (6427K kernel code, 292K rwdata, 2128K rodata, 284K init, 420K bss, 347064K reserved, 0K highmem)

Virtual kernel memory layout:

vector : 0xffff0000 - 0xffff1000 ( 4 kB)

fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)

vmalloc : 0xc1000000 - 0xff000000 ( 992 MB)

lowmem : 0x82000000 - 0xc0f00000 (1007 MB)

pkmap : 0x81e00000 - 0x82000000 ( 2 MB)

modules : 0x81000000 - 0x81e00000 ( 14 MB)

.text : 0x82008000 - 0x82863074 (8557 kB)

.init : 0x82864000 - 0x828ab000 ( 284 kB)

.data : 0x828ac000 - 0x828f5080 ( 293 kB)

.bss : 0x828f508c - 0x8295e128 ( 421 kB)

SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1

Preemptible hierarchical RCU implementation.

RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=1.

RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1

NR_IRQS:16 nr_irqs:16 16

L310 cache controller enabled

l2x0: 16 ways, CACHE_ID 0x410000c8, AUX_CTRL 0x32030000, Cache size: 256 kB

Switching to timer-based delay loop

sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 1431655765682ns

clocksource_of_init: no matching clocksources found

Console: colour dummy device 80x30

Calibrating delay loop (skipped), value calculated using timer frequency.. 6.00 BogoMIPS (lpj=30000)

pid_max: default: 32768 minimum: 301

Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)

Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)

CPU: Testing write buffer coherency: ok

CPU0: thread -1, cpu 0, socket 0, mpidr 80000000

Setting up static identity map for 0x8164c7e8 - 0x8164c840

Brought up 1 CPUs

SMP: Total of 1 processors activated (6.00 BogoMIPS).

CPU: All CPU(s) started in SVC mode.

devtmpfs: initialized

VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 4

pinctrl core: initialized pinctrl subsystem

regulator-dummy: no parameters

NET: Registered protocol family 16

DMA: preallocated 256 KiB pool for atomic coherent allocations

cpuidle: using governor ladder

cpuidle: using governor menu

Use WDOG1 as reset source

syscon 20c8000.anatop: regmap [mem 0x020c8000-0x020c8fff] registered

vdd1p1: 800 <--> 1375 mV at 1100 mV

vdd3p0: 2625 <--> 3400 mV at 3000 mV

vdd2p5: 2100 <--> 2875 mV at 2500 mV

cpu: 725 <--> 1450 mV at 1150 mV

vddpcie-phy: 725 <--> 1450 mV at 1100 mV

vddsoc: 725 <--> 1450 mV at 1175 mV

syscon 20e4000.iomuxc-gpr: regmap [mem 0x020e4000-0x020e7fff] registered

syscon 21bc000.ocotp-ctrl: regmap [mem 0x021bc000-0x021bffff] registered

syscon 21ac000.romcp: regmap [mem 0x021ac000-0x021affff] registered

hw-breakpoint: found 5 (+1 reserved) breakpoint and 1 watchpoint registers.

hw-breakpoint: maximum watchpoint size is 4 bytes.

imx6sx-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver

20dc000.gpc supply pu not found, using dummy regulator

MU is ready for cross core communication!

bio: create slab <bio-0> at 0

1P8V: 1800 mV

2P5V: 2500 mV

3P3V: 3300 mV

wlan-en: 3300 mV

2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 58, base_baud = 5000000) is a IMX

console [ttymxc0] enabled

21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 60, base_baud = 5000000) is a IMX

21f4000.serial: ttymxc4 at MMIO 0x21f4000 (irq = 62, base_baud = 5000000) is a IMX

SCSI subsystem initialized

usbcore: registered new interface driver usbfs

usbcore: registered new interface driver hub

usbcore: registered new device driver usb

i2c i2c-0: IMX I2C adapter registered

i2c i2c-1: IMX I2C adapter registered

i2c i2c-2: IMX I2C adapter registered

Linux video capture interface: v2.00

pps_core: LinuxPPS API ver. 1 registered

PTP clock support registered

MIPI CSI2 driver module loaded

Advanced Linux Sound Architecture Driver Initialized.

Bluetooth: Core ver 2.18

NET: Registered protocol family 31

Bluetooth: HCI device and connection manager initialized

Bluetooth: HCI socket layer initialized

Bluetooth: L2CAP socket layer initialized

Bluetooth: SCO socket layer initialized

Switched to clocksource mxc_timer1

NET: Registered protocol family 2

TCP established hash table entries: 8192 (order: 3, 32768 bytes)

TCP bind hash table entries: 8192 (order: 4, 65536 bytes)

TCP: Hash tables configured (established 8192 bind 8192)

TCP: reno registered

UDP hash table entries: 512 (order: 2, 16384 bytes)

UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)

NET: Registered protocol family 1

RPC: Registered named UNIX socket transport module.

RPC: Registered udp transport module.

RPC: Registered tcp transport module.

RPC: Registered tcp NFSv4.1 backchannel transport module.

hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver, 7 counters available

Bus freq driver module loaded

futex hash table entries: 256 (order: 2, 16384 bytes)

VFS: Disk quotas dquot_6.5.2

Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)

squashfs: version 4.0 (2009/01/31) Phillip Lougher

NFS: Registering the id_resolver key type

Key type id_resolver registered

Key type id_legacy registered

fuse init (API version 7.22)

msgmni has been set to 1976

io scheduler noop registered

io scheduler deadline registered

io scheduler cfq registered (default)

tfp410 1-0038: i2c block read failed, retry=0

tfp410 1-0038: i2c block read failed, retry=1

tfp410 1-0038: i2c block read failed, retry=2

tfp410 1-0038: i2c block read failed, retry=3

tfp410 1-0038: i2c block read failed, retry=4

tfp410 1-0038: i2c block read failed, retry=5

tfp410 1-0038: i2c block read failed, retry=6

tfp410 1-0038: i2c block read failed, retry=7

tfp410: probe of 1-0038 failed with error -5

i2c-core: driver [tfp410] using legacy suspend method

i2c-core: driver [tfp410] using legacy resume method

add tfp410 i2c driver

ldb ldb.14: failed to get clk choice0

ldb ldb.14: failed to get clk choice1

ldb ldb.14: failed to get clk choice2

ldb ldb.14: failed to get clk choice3

DISPLAY: Power-on latency exceeded, new value 28000 ns

Console: switching to colour frame buffer device 160x45

DISPLAY: Power-off latency exceeded, new value 27000 ns

DISPLAY: Power-on latency exceeded, new value 30333 ns

mxsfb 2220000.lcdif: initialized

imx-sdma 20ec000.sdma: no iram assigned, using external mem

imx-sdma 20ec000.sdma: no event needs to be remapped

imx-sdma 20ec000.sdma: loaded firmware 3.1

imx-sdma 20ec000.sdma: initialized

serial: Freescale lpuart driver

imx sema4 driver is registered.

IMX MCC libmcc TTY driver module loaded

[drm] Initialized drm 1.1.0 20060810

[drm] Initialized vivante 1.0.0 20120216 on minor 0

brd: module loaded

loop: module loaded

[max77823_init] start

m25p80 spi0.0: sst25vf016b (2048 Kbytes)

4 ofpart partitions found on MTD device spi0.0

Creating 4 MTD partitions on "spi0.0":

0x000000000000-0x0000000c0000 : "U-Boot"

ftl_cs: FTL header not found.

0x0000000c0000-0x0000000c2000 : "env"

ftl_cs: FTL header not found.

0x0000000c2000-0x0000001e0000 : "Kernel"

ftl_cs: FTL header not found.

0x0000001e0000-0x000000200000 : "M4"

ftl_cs: FTL header not found.

spi_imx 2008000.ecspi: probed

CAN device driver interface

phyirq=164

pps pps0: new PPS source ptp0

libphy: fec_enet_mii_bus: probed

fec 2188000.ethernet eth0: registered PHC device 0

phyirq=168

pps pps1: new PPS source ptp1

fec 21b4000.ethernet eth1: registered PHC device 1

ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver

ehci-pci: EHCI PCI platform driver

usbcore: registered new interface driver cdc_acm

cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters

usbcore: registered new interface driver usb-storage

usbcore: registered new interface driver usbserial

usbcore: registered new interface driver usbserial_generic

usbserial: USB Serial support registered for generic

usbcore: registered new interface driver cp210x

usbserial: USB Serial support registered for cp210x

usbcore: registered new interface driver ftdi_sio

usbserial: USB Serial support registered for FTDI USB Serial Device

usbcore: registered new interface driver keyspan

usbserial: USB Serial support registered for Keyspan - (without firmware)

usbserial: USB Serial support registered for Keyspan 1 port adapter

usbserial: USB Serial support registered for Keyspan 2 port adapter

usbserial: USB Serial support registered for Keyspan 4 port adapter

usbcore: registered new interface driver pl2303

usbserial: USB Serial support registered for pl2303

usbcore: registered new interface driver qcserial

usbserial: USB Serial support registered for Qualcomm USB modem

2184800.usbmisc supply vbus-wakeup not found, using dummy regulator

mousedev: PS/2 mouse device common for all mice

i2c-core: driver [crtouch] using legacy suspend method

i2c-core: driver [crtouch] using legacy resume method

egalax_ts 2-0004: Failed to read firmware version

egalax_ts: probe of 2-0004 failed with error -5

ft5x06-ts 2-0038: ft5x06: Could not detect touch screen.

ft5x06: ts_init

check_alarm_past: alarm in the past

snvs_rtc 20cc034.snvs-rtc-lp: rtc core: registered 20cc034.snvs-rtc-lp as rtc0

i2c /dev entries driver

pxp-v4l2 pxp_v4l2_out.18: initialized

i2c-core: driver [mag3110] using legacy suspend method

i2c-core: driver [mag3110] using legacy resume method

imx2-wdt 20bc000.wdog: IMX2+ Watchdog Timer enabled. timeout=60s (nowayout=0)

sdhci: Secure Digital Host Controller Interface driver

sdhci: Copyright(c) Pierre Ossman

sdhci-pltfm: SDHCI platform and OF driver helper

sdhci-esdhc-imx 2194000.usdhc: could not get ultra high speed state, work on normal mode

mmc0: no vqmmc regulator found

mmc0: SDHCI controller on 2194000.usdhc [2194000.usdhc] using ADMA

sdhci-esdhc-imx 2198000.usdhc: could not get ultra high speed state, work on normal mode

mmc2: no vqmmc regulator found

mmc0: host does not support reading read-only switch. assuming write-enable.

mmc0: new high speed SDHC card at address 59b4

mmcblk0: mmc0:59b4 USD 3.74 GiB

mmcblk0: p1 p2

mmc2: SDHCI controller on 2198000.usdhc [2198000.usdhc] using ADMA

mmc1: no vqmmc regulator found

mmc1: SDHCI controller on 219c000.usdhc [219c000.usdhc] using ADMA

mmc1: BKOPS_EN bit is not set

mmc1: new HS200 MMC card at address 0001

mmcblk1: mmc1:0001 S10004 3.56 GiB

mmcblk1boot0: mmc1:0001 S10004 partition 1 4.00 MiB

mmcblk1boot1: mmc1:0001 S10004 partition 2 4.00 MiB

mmcblk1rpmb: mmc1:0001 S10004 partition 3 4.00 MiB

caam 2100000.caam: Instantiated RNG4 SH0

mmcblk1: unknown partition table

mmcblk1boot1: unknown partition table

mmcblk1boot0: unknown partition table

caam 2100000.caam: Instantiated RNG4 SH1

caam 2100000.caam: device ID = 0x0a160100 (Era 4)

caam 2100000.caam: job rings = 2, qi = 0

caam algorithms registered in /proc/crypto

caam_jr 2101000.jr0: registering rng-caam

usbcore: registered new interface driver usbhid

usbhid: USB HID core driver

sgtl5000 0-000a: sgtl5000 revision 0x11

init_gpio_data:-2

init_gpio_data:118

0-000a: 1200 mV normal

sgtl5000 0-000a: Using internal LDO instead of VDDD

imx-sgtl5000 sound_sgtl5000.20: sgtl5000 <-> 2028000.ssi mapping ok

NET: Registered protocol family 26

TCP: cubic registered

NET: Registered protocol family 10

sit: IPv6 over IPv4 tunneling driver

NET: Registered protocol family 17

can: controller area network core (rev 20120528 abi 9)

NET: Registered protocol family 29

can: raw protocol (rev 20120528)

can: broadcast manager protocol (rev 20120528 t)

can: netlink gateway (rev 20130117) max_hops=1

Bluetooth: RFCOMM TTY layer initialized

Bluetooth: RFCOMM socket layer initialized

Bluetooth: RFCOMM ver 1.11

Bluetooth: BNEP (Ethernet Emulation) ver 1.3

Bluetooth: BNEP filters: protocol multicast

Bluetooth: BNEP socket layer initialized

8021q: 802.1Q VLAN Support v1.8

rfkill_gpio bt_rfkill.17: bt_rfkill device registered.

Key type dns_resolver registered

cpu cpu0: dev_pm_opp_get_opp_count: device OPP not found (-19)

Registering SWP/SWPB emulation handler

A9-M4 sema4 num 6, A9-M4 magic number 0x12345678 - 0x5e48fabc.

imx6q-pcie 8ffc000.pcie: phy link never came up

imx6q-pcie 8ffc000.pcie: Failed to bring link up!

imx6q-pcie 8ffc000.pcie: failed to initialize host

imx6q-pcie: probe of 8ffc000.pcie failed with error -22

wlan-en: disabling

regulator-dummy: disabling

snvs_rtc 20cc034.snvs-rtc-lp: setting system clock to 1970-01-01 00:00:01 UTC (1)

ALSA device list:

#0: imx6sx-nitrogen6sx-sgtl5000

EXT3-fs (mmcblk0p2): error: couldn't mount because of unsupported optional features (240)

EXT2-fs (mmcblk0p2): error: couldn't mount because of unsupported optional features (244)

EXT4-fs (mmcblk0p2): INFO: recovery required on readonly filesystem

EXT4-fs (mmcblk0p2): write access will be enabled during recovery

random: nonblocking pool is initialized

EXT4-fs (mmcblk0p2): recovery complete

EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)

VFS: Mounted root (ext4 filesystem) readonly on device 179:2.

devtmpfs: mounted

Freeing unused kernel memory: 284K (82864000 - 828ab000)

INIT: version 2.88 booting

Starting udev

udevd[157]: starting version 182

EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)

bootlogd: cannot allocate pseudo tty: No such file or directory

Populating dev cache

tar: dev/disk/by-label/Bootx20nitrog: No such file or directory

tar: error exit delayed from previous errors

udev-cache: update failed!

Thu Jan 21 04:07:41 UTC 2016

INIT: Entering runlevel: 5

Configuring network interfaces... fec 2188000.ethernet eth0: Freescale FEC PHY driver [Atheros 8035 ethernet] (mii_bus:phy_addr=2188000.ethernet:04, irq=164)

IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready

The M4 seems to hang somewhere around the Freeing unused kernel memory message.

Something is obviously accessing memory where the M4 is in DDR, but how can I troubleshoot this?

I've tried:

Setting PHYS_OFFSET to 0x81000000 in Linux
Setting PAGE_OFFSET to 0x82000000 in Linux
Reserving memory via the Device Tree Binary (https://www.kernel.org/doc/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt)

Thanks

/ Finn

CarlosCasillas · ‎01-26-2016

Hi Finn,

Have you ensured the DDR boundaries for MQX and Linux in order to avoid memory overlay? These details are mentioned on section 3.1 of the application note that you referred:

Hope this will be useful for you.
Best regards!
/Carlos

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gary_bisson · ‎01-22-2016

Hi Finn,

The "Freeing unused memory" is displayed when the kernel starts the user-space init process. If you think that is when the error occurs, could you make a test where you removed the init process from your rootfs? This will crash the Linux bootup but it'd be good to see if the M4 is still running at that time, although I don't suspect the user-space to be an issue here.

Otherwise, have you tried a different place of RAM, at the end for instance like we do for the shared memory. Can you try that and update the "linux,usable-memory" accordingly?

linux-imx6/imx6sx-nitrogen6sx-m4.dts at boundary-imx_3.14.28_1.0.0_ga · boundarydevices/linux-imx6 ·...

Hope this helps.

Regards,

Gary

Loading the M4 in DDR (memory conflict)

Loading the M4 in DDR (memory conflict)

i.MX6SoloX