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ARM: Disable outer cache before kexec call -V3

Andrea Paterniani linux-arm-kernel 1 version New

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Cover letter [patch 0/2] ARM: Disable outer cache before kexec call -V3

Il 03/08/2010 19.36, Gadiyar, Anand ha scritto:

Quoted 19 lines
Quoted 17 lines · Andrea Paterniani

Hi,
I have applied your patches to kernel 2.6.35-rc4 running on my beagleboard.
I'm using kexec-tools-2.0.1.

My u-boot bootargs is:

      console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait ip=192.168.2.13::255.255.255.0

To restart the system I type:

Quoted 3 lines

sync
kexec -l /boot/zImage --append="console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait ip=192.168.2.13::255.255.255.0" kexec -e

Not every time the system restart.
In some cases no output on the console after the following:
Bye!
Uncompressing Linux... done, booting the kernel.

Quoted 7 lines
Quoted 3 lines

Any idea?

Can you try building your kernel with CONFIG_EARLY_PRINTK, and add the word "earlyprintk" to your bootargs?

How to enable EARLY_PRINTK for ARM architecture?
Browsing kernel source I find arch/arm/kernel/early_printk.c but no way to enable CONFIG_EARLY_PRINTK from make menuconfig.
Is there any patch to have this config option for ARM?

- Andrea

Quoted 25 lines
Quoted 24 lines

Il 05/07/2010 13.52, Thomas Gleixner ha scritto:

Quoted 20 lines

The following patch series addresses the problem that the kexec code does not disable the outer cache before disabling the inner cache and jumping into the new kernel. This results in random crashes of the new kernel.

Changes since version 2:

- Use CLEAN_INV_WAY in l2x0_flush_all according to Catalin

- Rename outer_cache_disable() to outer_disable()

- Added a BUG_ON() when l2x0_inv_all() is called with L2 enabled.

Thanks,

tglx

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