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arm: mvebu: Disable MMU before changing register base address

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Only with disabled MMU its possible to switch the base register address on
Armada 38x. Without this the SDRAM located at >= 0x4000.0000 is also not
accessible, as its still locked to cache.

Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Stefan Roese 2015-04-24 10:49:11 +02:00 committed by Luka Perkov
parent e3cccf9eb2
commit 9f62b44ec7
1 changed files with 18 additions and 0 deletions
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18
arch/arm/mach-mvebu/cpu.c
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@ -163,6 +163,14 @@ static void update_sdram_window_sizes(void)
}
}
void mmu_disable(void)
{
asm volatile(
"mrc p15, 0, r0, c1, c0, 0\n"
"bic r0, #1\n"
"mcr p15, 0, r0, c1, c0, 0\n");
}
#ifdef CONFIG_ARCH_CPU_INIT
static void set_cbar(u32 addr)
{
@ -172,6 +180,16 @@ static void set_cbar(u32 addr)
int arch_cpu_init(void)
{
#ifndef CONFIG_SPL_BUILD
/*
* Only with disabled MMU its possible to switch the base
* register address on Armada 38x. Without this the SDRAM
* located at >= 0x4000.0000 is also not accessible, as its
* still locked to cache.
*/
mmu_disable();
#endif
/* Linux expects the internal registers to be at 0xf1000000 */
writel(SOC_REGS_PHY_BASE, INTREG_BASE_ADDR_REG);
set_cbar(SOC_REGS_PHY_BASE + 0xC000);