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[ar71xx] add a workaround for fixing the bad performance of the Ubiquiti RouterStation/LS-SR71 boards, until they fix their bootloader.

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@14556 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
juhosg 2009-02-18 19:58:43 +00:00
parent 13ef4d3117
commit 8e777a33d8
1 changed files with 32 additions and 0 deletions
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32
target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/kernel-entry-init.h Normal file
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/*
* Atheros AR71xx specific kernel entry setup
*
* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
*/
#ifndef __ASM_MACH_AR71XX_KERNEL_ENTRY_H
#define __ASM_MACH_AR71XX_KERNEL_ENTRY_H
/*
* Some bootloaders set the 'Kseg0 coherency algorithm' to
* 'Cacheable, noncoherent, write-through, no write allocate'
* and this cause performance issues. Let's go and change it to
* 'Cacheable, noncoherent, write-back, write allocate'
*/
.macro kernel_entry_setup
mfc0 t0, CP0_CONFIG
li t1, ~CONF_CM_CMASK
and t0, t1
ori t0, CONF_CM_CACHABLE_NONCOHERENT
mtc0 t0, CP0_CONFIG
nop
.endm
.macro smp_slave_setup
.endm
#endif /* __ASM_MACH_AR71XX_KERNEL_ENTRY_H */