[U-Boot] [PATCH 0/4] arm: mvebu: Allow DB-88F6820-GP to boot Linux
Changes needed to allow the DB-88F6820-GP development board to successfully boot a Linux kernel.
Kevin Smith (3): arm: mvebu: Update CBAR with SOC regs base mv-common.h: Include support for device trees db-88f6820-gp.h: Load data blobs into lower memory
Stefan Roese (1): arm: mvebu: Disable L2 cache before enabling d-cache
arch/arm/mach-mvebu/cpu.c | 15 +++++++++++++++ include/configs/db-88f6820-gp.h | 5 +++++ include/configs/mv-common.h | 2 ++ 3 files changed, 22 insertions(+)
From: Stefan Roese sr@denx.de
L2 cache may still be enabled by the BootROM. We need to first disable it before enabling d-cache support.
Signed-off-by: Stefan Roese sr@denx.de Signed-off-by: Kevin Smith kevin.smith@elecsyscorp.com --- arch/arm/mach-mvebu/cpu.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/arch/arm/mach-mvebu/cpu.c b/arch/arm/mach-mvebu/cpu.c index 04681fc..417fc35 100644 --- a/arch/arm/mach-mvebu/cpu.c +++ b/arch/arm/mach-mvebu/cpu.c @@ -7,6 +7,7 @@ #include <common.h> #include <netdev.h> #include <asm/io.h> +#include <asm/pl310.h> #include <asm/arch/cpu.h> #include <asm/arch/soc.h>
@@ -240,6 +241,13 @@ int cpu_eth_init(bd_t *bis) #ifndef CONFIG_SYS_DCACHE_OFF void enable_caches(void) { + struct pl310_regs *const pl310 = + (struct pl310_regs *)CONFIG_SYS_PL310_BASE; + + /* First disable L2 cache - may still be enable from BootROM */ + if (mvebu_soc_family() == MVEBU_SOC_A38X) + clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN); + /* Avoid problem with e.g. neta ethernet driver */ invalidate_dcache_all();
SMP-enabled Linux kernels read the CBAR register in CP15 to find the address of the SCU registers. After remapping internal registers, also update the CBAR so the kernel can find them.
Signed-off-by: Kevin Smith kevin.smith@elecsyscorp.com --- arch/arm/mach-mvebu/cpu.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/arm/mach-mvebu/cpu.c b/arch/arm/mach-mvebu/cpu.c index 417fc35..2ac5349 100644 --- a/arch/arm/mach-mvebu/cpu.c +++ b/arch/arm/mach-mvebu/cpu.c @@ -161,10 +161,17 @@ static void update_sdram_window_sizes(void) }
#ifdef CONFIG_ARCH_CPU_INIT +static void set_cbar (u32 addr) +{ + asm ("mcr p15, 4, %0, c15, c0" : : "r" (addr)); +} + + int arch_cpu_init(void) { /* Linux expects the internal registers to be at 0xf1000000 */ writel(SOC_REGS_PHY_BASE, INTREG_BASE_ADDR_REG); + set_cbar (SOC_REGS_PHY_BASE);
/* * We need to call mvebu_mbus_probe() before calling
Signed-off-by: Kevin Smith kevin.smith@elecsyscorp.com --- include/configs/mv-common.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/include/configs/mv-common.h b/include/configs/mv-common.h index 51436da..03518b0 100644 --- a/include/configs/mv-common.h +++ b/include/configs/mv-common.h @@ -59,6 +59,8 @@ #define CONFIG_BOOTDELAY 3 /* default enable autoboot */ #define CONFIG_PREBOOT
+#define CONFIG_OF_LIBFDT 1 /* Device tree support */ + /* * For booting Linux, the board info and command line data * have to be in the first 8 MB of memory, since this is
By default on this platform, u-boot loads data into high memory in the range of 0x7Fxxxxxx, which generates a data abort when the kernel tries to read it. Config the u-boot environment to load the device tree and initrd image into lower memory to make them accessible to the kernel.
Signed-off-by: Kevin Smith kevin.smith@elecsyscorp.com --- include/configs/db-88f6820-gp.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/include/configs/db-88f6820-gp.h b/include/configs/db-88f6820-gp.h index 12a24ce..490d74e 100644 --- a/include/configs/db-88f6820-gp.h +++ b/include/configs/db-88f6820-gp.h @@ -63,6 +63,11 @@ #define CONFIG_SYS_CONSOLE_INFO_QUIET /* don't print console @ startup */ #define CONFIG_SYS_ALT_MEMTEST
+/* Keep device tree and initrd in lower memory so the kernel can access them */ +#define CONFIG_EXTRA_ENV_SETTINGS \ + "fdt_high=0x10000000\0" \ + "initrd_high=0x10000000\0" + /* * mv-common.h should be defined after CMD configs since it used them * to enable certain macros
participants (1)
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Kevin Smith