Help imx6q preempt_RT

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Help imx6q preempt_RT

Contributor I


I'm working on a card emtrion dimm mx6 with a freescale processor imx6q.

I am trying to make a linux 3.0.35 in a linux RT  with patch PREEMPT_RT.

When I compile the kernel, I have a lot of errors. I must add parameters to functions otherwise I can not compile. When I reboot the card with linux "RT", the reboot will stop

I'll put the boot error message :

Bytes transferred = 4108176 (3eaf90 hex) ## Booting kernel from Legacy Image at 10800000 ...

   Image Name:   Linux-3.0.35-rt56

   Created:      2013-09-04 9:22:47 UTC

   Image Type:   ARM Linux Kernel Image (uncompressed)

   Data Size:    4108112 Bytes = 3.9 MiB

   Load Address: 10008000

   Entry Point:  10008000

   Verifying Checksum ... OK

   Loading Kernel Image ... OK


Starting kernel ...

Uncompressing Linux... done, booting the kernel.

Linux version 3.0.35-rt56 (hico@emvm) (gcc version 4.7.2 (GCC) ) #12 SMP PREEMPT RT Wed Sep 4 11:22:37 CEST 2013

CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7), cr=10c53c7d

CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache

Machine: DIMM-MX6 Board

Memory policy: ECC disabled, Data cache writealloc CPU identified as i.MX6Q, silicon rev 1.2

PERCPU: Embedded 7 pages/cpu @8c00e000 s6272 r8192 d14208 u32768 Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 227328 Kernel command line: console=ttymxc1,115200n8 root=/dev/nfs rootwait nfsroot=,v3,tcp,nolock ip= ethaddr=00:1C:1E:08:38:AF video=mxcfb0:dev=lcd,800x480,if=RGB666,bpp=16

Warning: Assigning a globally valid ethernet address to a device You should set the 2nd rightmost bit in the first byte of the MAC, i.e. 02:1c:1e:08:38:af 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: 640MB 256MB = 896MB total

Memory: 896320k/896320k available, 152256k reserved, 0K highmem Virtual kernel memory layout:

    vector  : 0xffff0000 - 0xffff1000   (   4 kB)

    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)

    DMA     : 0xf4600000 - 0xffe00000   ( 184 MB)

    vmalloc : 0xc0800000 - 0xf2000000   ( 792 MB)

    lowmem  : 0x80000000 - 0xc0000000   (1024 MB)

    modules : 0x7f000000 - 0x80000000   (  16 MB)

      .init : 0x80008000 - 0x8003b000   ( 204 kB)

      .text : 0x8003b000 - 0x80ae7fc8   (10932 kB)

      .data : 0x80ae8000 - 0x80b524e8   ( 426 kB)

       .bss : 0x80b5250c - 0x80bbd7b4   ( 429 kB)

Preemptible hierarchical RCU implementation.


MXC GPIO hardware

sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 1431655ms arm_max_freq=1GHz MXC_Early serial console at MMIO 0x21e8000 (options '115200n8') bootconsole [ttymxc1] enabled

Console: colour dummy device 80x30

Calibrating delay loop... 1581.05 BogoMIPS (lpj=7905280)

pid_max: default: 32768 minimum: 301

Mount-cache hash table entries: 512

CPU: Testing write buffer coherency: ok

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

CPU1: Booted secondary processor

CPU2: Booted secondary processor

CPU3: Booted secondary processor

Brought up 4 CPUs

SMP: Total of 4 processors activated (6324.22 BogoMIPS).

devtmpfs: initialized

print_constraints: dummy:

NET: Registered protocol family 16

print_constraints: vddpu: 725 <--> 1300 mV at 1100 mV fast normal

print_constraints: vddcore: 725 <--> 1300 mV at 1100 mV fast normal

print_constraints: vddsoc: 725 <--> 1300 mV at 1200 mV fast normal

print_constraints: vdd2p5: 2000 <--> 2775 mV at 2400 mV fast normal

print_constraints: vdd1p1: 800 <--> 1400 mV at 1100 mV fast normal

print_constraints: vdd3p0: 2625 <--> 3400 mV at 3000 mV fast normal

hw-breakpoint: found 6 breakpoint and 1 watchpoint registers.

hw-breakpoint: 1 breakpoint(s) reserved for watchpoint single-step.

hw-breakpoint: maximum watchpoint size is 4 bytes.

L310 cache controller enabled

l2x0: 16 ways, CACHE_ID 0x410000c7, AUX_CTRL 0x02070000, Cache size: 1048576 B

bio: create slab <bio-0> at 0

SCSI subsystem initialized

spi_imx imx6q-ecspi.1: probed

usbcore: registered new interface driver usbfs

usbcore: registered new interface driver hub

usbcore: registered new device driver usb Freescale USB OTG Driver loaded, $Revision: 1.55 $ mc_pfuze 0-0008: ID: 0,Full lay: 1 ,Metal lay: 1 mc_pfuze 0-0008: FAB: 0 ,FIN: 0

print_constraints: SW1A: 300 <--> 1875 mV at 1375 mV

print_constraints: SW1B: 300 <--> 1875 mV at 300 mV

print_constraints: SW1C: 300 <--> 1875 mV at 1375 mV

print_constraints: SW3A: 400 <--> 1975 mV at 1500 mV

print_constraints: SW3B: 400 <--> 1975 mV at 1500 mV

print_constraints: PFUZE100_SWBST: 5000 <--> 5150 mV at 5000 mV

print_constraints: VSNVS: 1200 <--> 3000 mV at 1800 mV

print_constraints: VREFDDR: at 750 mV

print_constraints: VGEN5: 1800 <--> 3300 mV at 2500 mV

print_constraints: VGEN6: 1800 <--> 3300 mV at 2800 mV pca953x 2-0026: interrupt support not compiled in

imx-ipuv3 imx-ipuv3.0: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7)

imx-ipuv3 imx-ipuv3.1: IPU DMFC NORMAL mode: 1(0~1), 5B(4,5), 5F(6,7) Advanced Linux Sound Architecture Driver Version 1.0.24.

Bluetooth: Core ver 2.16

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

cfg80211: Calling CRDA to update world regulatory domain

i2c-core: driver [max17135] using legacy suspend method

i2c-core: driver [max17135] using legacy resume method Switching to clocksource mxc_timer1

NET: Registered protocol family 2

IP route cache hash table entries: 32768 (order: 5, 131072 bytes) TCP established hash table entries: 131072 (order: 8, 1048576 bytes) TCP bind hash table entries: 65536 (order: 9, 2097152 bytes)

TCP: Hash tables configured (established 131072 bind 65536) TCP reno registered UDP hash table entries: 512 (order: 3, 40960 bytes) UDP-Lite hash table entries: 512 (order: 3, 40960 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.

PMU: registered new PMU device of type 0 Static Power Management for Freescale i.MX6 wait mode is enabled for i.MX6 cpaddr = c0880000 suspend_iram_base=c0918000 PM driver module loaded IMX usb wakeup probe add wake up source irq 75 IMX usb wakeup probe cpu regulator mode:ldo_enable i.MXC CPU frequency driver

JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.

msgmni has been set to 1750

alg: No test for stdrng (krng)

io scheduler noop registered

io scheduler deadline registered

io scheduler cfq registered (default)

MIPI DSI driver module loaded

mxc_sdc_fb mxc_sdc_fb.0: register mxc display driver lcd mxc_sdc_fb mxc_sdc_fb.1: register mxc display driver ldb

_regulator_get: get() with no identifier imx-sdma imx-sdma: loaded firmware 1.1 imx-sdma imx-sdma: loaded firmware 1.1 imx-sdma imx-sdma: initialized imx-sdma imx-sdma: initialized

Serial: IMX driver

Serial: IMX driver

imx-uart.0: ttymxc0 at MMIO 0x2020000 (irq = 58) is a IMX

imx-uart.0: ttymxc0 at MMIO 0x2020000 (irq = 58) is a IMX

imx-uart.1: ttymxc1 at MMIO 0x21e8000 (irq = 59) is a IMX

imx-uart.1: ttymxc1 at MMIO 0x21e8000 (irq = 59) is a IMX

console [ttymxc1] enabled, bootconsole disabled

If you succeeded in make your linux RT I am interested in any help

Best regards

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2 Replies

Contributor I

i met the same error

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Contributor IV

Is there really no working patch for PREEMPT_RT?

I thought realtime is one of the main requirements in automotive applications.

Are there any good news?


As I see a PREEMPT_RT Kernel 3.12.6-rt9 is running on a sabre board in a OSADL test rack.

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