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Using ioremap on iMX6

Question asked by mondher ammar on Jun 23, 2016
Latest reply on Jun 24, 2016 by mondher ammar

I am trying to map physical memory allocated at boot time to virtual kernel space and virtual user space address using ioremap() and remap_pfn_range(), so i developped a kernel module that implement those to functions, i tested the module on ubuntu (3.13.0-86-generic) and it's work fine, but when i cross copile it and insert it to my imx6 board i get the following error :


WARNING: CPU: 0 PID: 521 at arch/arm/mm/ioremap.c:301 __arm_ioremap_pfn_caller+0x17c/0x1bc()

Modules linked in: memmapMod(O+)

CPU: 0 PID: 521 Comm: insmod Tainted: G        W  O 3.14.12-rt9-ga81067a #1


[<80012100>] (dump_backtrace) from [<800123e0>] (show_stack+0x18/0x1c)

r6:808aa37c r5:ffffffff r4:00000000 r3:00000000

[<800123c8>] (show_stack) from [<806386e4>] (dump_stack+0x80/0xd4)

[<80638664>] (dump_stack) from [<80027960>] (warn_slowpath_common+0x70/0x94)

r7:0000012d r6:8001bd40 r5:00000009 r4:00000000

[<800278f0>] (warn_slowpath_common) from [<80027a28>] (warn_slowpath_null+0x24/0x2c)

r8:01400000 r7:0001e000 r6:808988d4 r5:1e000000 r4:00000000

[<80027a04>] (warn_slowpath_null) from [<8001bd40>] (__arm_ioremap_pfn_caller+0x17c/0x1bc)

[<8001bbc4>] (__arm_ioremap_pfn_caller) from [<8001bdd8>] (__arm_ioremap_caller+0x58/0x60)

r9:7f00429c r8:00000001 r7:9bc48148 r6:9bc48140 r5:7f004094 r4:7f0043cc

[<8001bd80>] (__arm_ioremap_caller) from [<8001baac>] (__arm_ioremap+0x1c/0x24)

[<8001ba90>] (__arm_ioremap) from [<7f0040d8>] (simple_init+0x44/0xa4 [memmapMod])

[<7f004094>] (simple_init [memmapMod]) from [<8000894c>] (do_one_initcall+0xf8/0x168)


[<80008854>] (do_one_initcall) from [<80089da8>] (load_module+0x1a48/0x1f28)

r10:7f004290 r9:7f00429c r8:00000001 r7:9bc48148 r6:9bc48140 r5:00000001


[<80088360>] (load_module) from [<8008a3f0>] (SyS_finit_module+0x70/0x80)

r10:00000000 r9:9cf68000 r8:8000ec84 r7:0000017b r6:0002499c r5:00000003


[<8008a380>] (SyS_finit_module) from [<8000eb00>] (ret_fast_syscall+0x0/0x30)

r6:00000000 r5:00000000 r4:00000000

---[ end trace 0000000000000003 ]---


memmapMod is the name of my module, i am using linux 3.14.12 on Cortex-A9 Freescale i.MX6 Solo

have any one idea how to sole this problem ?