On 16:30 Sun 12 Aug , Sascha Hauer wrote:
> Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> ---
> arch/arm/cpu/Makefile | 4 ++++
> arch/arm/cpu/start-pbl.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 49 insertions(+)
>
> diff --git a/arch/arm/cpu/Makefile b/arch/arm/cpu/Makefile
> index 78d300d..0ecc72e 100644
> --- a/arch/arm/cpu/Makefile
> +++ b/arch/arm/cpu/Makefile
> @@ -10,9 +10,13 @@ obj-$(CONFIG_CMD_ARM_CPUINFO) += cpuinfo.o
> obj-$(CONFIG_CMD_ARM_MMUINFO) += mmuinfo.o
> obj-$(CONFIG_MMU) += mmu.o
> obj-$(CONFIG_CPU_32v4T) += cache-armv4.o
> +pbl-$(CONFIG_CPU_32v4T) += cache-armv4.o
> obj-$(CONFIG_CPU_32v5) += cache-armv5.o
> +pbl-$(CONFIG_CPU_32v5) += cache-armv5.o
> obj-$(CONFIG_CPU_32v6) += cache-armv6.o
> +pbl-$(CONFIG_CPU_32v6) += cache-armv6.o
> obj-$(CONFIG_CPU_32v7) += cache-armv7.o
> +pbl-$(CONFIG_CPU_32v7) += cache-armv7.o
> obj-$(CONFIG_CACHE_L2X0) += cache-l2x0.o
>
> pbl-y += start-pbl.o start-reset.o
> diff --git a/arch/arm/cpu/start-pbl.c b/arch/arm/cpu/start-pbl.c
> index 004ba6a..1b67e2a 100644
> --- a/arch/arm/cpu/start-pbl.c
> +++ b/arch/arm/cpu/start-pbl.c
> @@ -28,6 +28,9 @@
> #include <asm/barebox-arm-head.h>
> #include <asm-generic/memory_layout.h>
> #include <asm/sections.h>
> +#include <asm/pgtable.h>
> +
> +#include "mmu.h"
>
> unsigned long free_mem_ptr;
> unsigned long free_mem_end_ptr;
> @@ -50,14 +53,53 @@ extern void *input_data_end;
> #include "../../../../lib/decompress_inflate.c"
> #endif
>
> +static void mmu_enable(unsigned long *ttb)
> +{
> + int i;
> +
> + /* Set the ttb register */
> + asm volatile ("mcr p15,0,%0,c2,c0,0" : : "r"(ttb) /*:*/);
> +
> + /* Set the Domain Access Control Register */
> + i = 0x3;
> + asm volatile ("mcr p15,0,%0,c3,c0,0" : : "r"(i) /*:*/);
> +
> + /* create a flat mapping using 1MiB sections */
> + for (i = 0; i < 4096; i++)
> + ttb[i] = (i << 20) | PMD_SECT_AP_WRITE |
> + PMD_SECT_AP_READ | PMD_TYPE_SECT |
> + PMD_SECT_WB;
> +
> + __mmu_cache_on();
> +}
> +
> +static void mmu_disable(void)
> +{
> + __mmu_cache_flush();
> + __mmu_cache_off();
> +}
> +
> static void barebox_uncompress(void *compressed_start, unsigned int len)
> {
> void (*barebox)(void);
> + unsigned long *ttb;
> + /*
> + * We create a flat mapping for the whole address space
> + * and enable the MMU here. This means that you cannot use
> + * any hardware like UARTs while the MMU is on. If you want
> + * to debug this code disable MMU support below.
> + */
> + int use_mmu = IS_ENABLED(CONFIG_MMU);
I really do not like it as I do want to be able to use nand flash as the same
time or other controller so we need a better to handle it
Best Regards,
J.
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