Kernel halts while invalidating TLB

masasi — Thu, 09 Apr 2015 12:27:28 GMT

Hi, I am trying to boot SDK 1.6 kernel in my P1012 board.

The uboot configures TLBs correctly but once the kernel boots, it halts while invalidating TLBs(flush_tlbs at head_32.S file) .

Kernel is loaded at 0x00000000 and uboot configures a TLB for DDR at 0x00000000. The console output is the following:

/********************************************************************************************/

=> boot

WARNING: adjusting available memory to 30000000

## Booting kernel from Legacy Image at 02000000 ...

Image Name: WTMKII PM Linux kernel5

Created: 2015-04-09 10:56:29 UTC

Image Type: PowerPC Linux Kernel Image (gzip compressed)

Data Size: 3929672 Bytes = 3.7 MiB

Load Address: 00000000

Entry Point: 00000000

Verifying Checksum ... OK

## Loading init Ramdisk from Legacy Image at 10000000 ...

Image Name: ramdisk_0n_2.img

Created: 2015-03-30 13:58:24 UTC

Image Type: PowerPC Linux RAMDisk Image (lzo compressed)

Data Size: 9565405 Bytes = 9.1 MiB

Load Address: 00000000

Entry Point: 00000000

Verifying Checksum ... OK

## Flattened Device Tree from Legacy Image at 03000000

Image Name: pmDTB

Created: 2015-04-08 10:57:38 UTC

Image Type: PowerPC Linux Flat Device Tree (uncompressed)

Data Size: 14821 Bytes = 14.5 KiB

Load Address: 06000000

Entry Point: 00000000

Verifying Checksum ... OK

Booting using the fdt blob at 0x6000000

Uncompressing Kernel Image ... OK

Loading Ramdisk to 2f6e0000, end 2ffff4dd ... OK

Loading Device Tree to 03ff9000, end 03fff9e4 ... OK

WARNING: could not find compatible node fsl-usb2-dr: FDT_ERR_NOTFOUND.

## Transferring control to Linux (at address 00000000) ...

Booting using OF flat tree...

/********************************************************************************************/

Code is crashing at head_32.S:

flush_tlbs:

lis r10,0x40

1:addic. r10,r10,-0x1000

tlbie r10 <-- Kernel halts after this instruction

bgt 1b

sync

blr

I don't understand why kernel needs to override current TLB instead of creating a new one. Has anybody faced a similar problem?

Thanks in advanced,

Maria

Re: Kernel halts while invalidating TLB

scottwood — Thu, 09 Apr 2015 21:34:04 GMT

P1012 has an e500 core which does not implement the tlbie instruction and is not supported by head_32.S. You need to build an e500 kernel instead, such as mpc85xx_defconfig.

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Kernel halts while invalidating TLB

Re: Kernel halts while invalidating TLB