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https://github.com/AsahiLinux/u-boot
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81b0618ddf
Booting the kernel fails on RK3288 (and probably other rockchip SoCs) when the i-cache is disabled/flushed before d-cache. I have not investigated whether this is due to U-Boot hanging or whether it's very early in the linux boot, but following the approach of the various rockchip U-Boot forks (first disable d-cache then i-cache) makes things work. Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>
84 lines
1.8 KiB
C
84 lines
1.8 KiB
C
/*
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* (C) Copyright 2008 Texas Insturments
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* CPU specific code
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*/
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#include <common.h>
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#include <command.h>
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#include <asm/system.h>
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#include <asm/cache.h>
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#include <asm/armv7.h>
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#include <linux/compiler.h>
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void __weak cpu_cache_initialization(void){}
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int cleanup_before_linux_select(int flags)
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{
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/*
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* this function is called just before we call linux
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* it prepares the processor for linux
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*
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* we turn off caches etc ...
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*/
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#ifndef CONFIG_SPL_BUILD
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disable_interrupts();
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#endif
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if (flags & CBL_DISABLE_CACHES) {
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/*
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* turn off D-cache
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* dcache_disable() in turn flushes the d-cache and disables MMU
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*/
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dcache_disable();
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v7_outer_cache_disable();
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/*
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* After D-cache is flushed and before it is disabled there may
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* be some new valid entries brought into the cache. We are
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* sure that these lines are not dirty and will not affect our
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* execution. (because unwinding the call-stack and setting a
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* bit in CP15 SCTRL is all we did during this. We have not
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* pushed anything on to the stack. Neither have we affected
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* any static data) So just invalidate the entire d-cache again
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* to avoid coherency problems for kernel
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*/
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invalidate_dcache_all();
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icache_disable();
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invalidate_icache_all();
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} else {
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/*
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* Turn off I-cache and invalidate it
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*/
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icache_disable();
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invalidate_icache_all();
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flush_dcache_all();
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invalidate_icache_all();
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icache_enable();
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}
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/*
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* Some CPU need more cache attention before starting the kernel.
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*/
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cpu_cache_initialization();
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return 0;
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}
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int cleanup_before_linux(void)
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{
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return cleanup_before_linux_select(CBL_ALL);
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}
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