XIP Kernel freeze

XIP Kernel freeze

[Darius]

Hi All,

I'm using XIP kernel on i.MXL board MXLADS V2.0
This board has two 16bit NOR Flahs devices configured as one 32bit memory.
Overall 32Mbytes Flash. Memory chips are Spansion S29PL127.

kernel freezes when booting on this line from cfi_probe.c:

cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
--->>> cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);

First two commands are sent successful, but after last one kernel freezes.
This happens almost everytime when booting kernel, but not allways.
Sometimes, very rare, kernel is booting normaly.
When kernel is booted successful, everything works ok - i can write and erase to and from flash memory.

Where can be a problem? Is it possible that it is caused by hardware?

Re: XIP Kernel freeze

[Darius]

Darius wrote:
> Hi All,
> 
> I'm using XIP kernel on i.MXL board MXLADS V2.0
> This board has two 16bit NOR Flahs devices configured as one 32bit memory.
> Overall 32Mbytes Flash. Memory chips are Spansion S29PL127.
> 
> kernel freezes when booting on this line from cfi_probe.c:
> 
> cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
> cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
> --->>> cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
> 
> First two commands are sent successful, but after last one kernel freezes.
> This happens almost everytime when booting kernel, but not allways.
> Sometimes, very rare, kernel is booting normaly.
> When kernel is booted successful, everything works ok - i can write and erase to and from flash memory.
> 
> Where can be a problem? Is it possible that it is caused by hardware?
> 

kernel is 2.6.26-git7
when compiling, I'm getting such warnings:

  CC      drivers/mtd/chips/cfi_probe.o
/tmp/cc4TCFuE.s: Assembler messages:
/tmp/cc4TCFuE.s:56: Warning: ignoring changed section attributes for .data
   CC      drivers/mtd/chips/cfi_util.o
/tmp/ccisjcki.s: Assembler messages:
/tmp/ccisjcki.s:295: Warning: ignoring changed section attributes for .data
   CC      drivers/mtd/chips/cfi_cmdset_0002.o
/tmp/cc9DRNfF.s: Assembler messages:
/tmp/cc9DRNfF.s:1974: Warning: ignoring changed section attributes for .data
   CC      drivers/mtd/chips/gen_probe.o

Re: XIP Kernel freeze

[Jared Hulbert]

You can turn on MTD_XIP "XIP aware MTD support"

> kernel freezes when booting on this line from cfi_probe.c:
>
> cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
> cfi_send_gen_cmd(0xFF, 0, base, map, cfi, cfi->device_type, NULL);
> --->>> cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
>
When you issue that last command it will trigger the Flash to output
status instead of data.


> This board has two 16bit NOR Flahs devices configured as one 32bit memory.
> Overall 32Mbytes Flash. Memory chips are Spansion S29PL127.

If the flash has multiple hardware partitions you might be able to
simply move the kernel to the end of the chip instead of the
beginning.