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author | Hans de Goede <hdegoede@redhat.com> | 2014-10-22 12:56:36 (GMT) |
---|---|---|
committer | Hans de Goede <hdegoede@redhat.com> | 2014-10-24 07:37:26 (GMT) |
commit | accc9e446be6c3bd129315a0c5830bddccfa16da (patch) | |
tree | 2a32f4bf120830503a6eb65033071b1414e31dcf | |
parent | d0dbc286036a4e4e01ca056e40d952a081162a8c (diff) | |
download | u-boot-fsl-qoriq-accc9e446be6c3bd129315a0c5830bddccfa16da.tar.xz |
sunxi: Add CONFIG_OLD_SUNXI_KERNEL_COMPAT Kconfig option
Add a Kconfig option which users can select when they want to boot older
kernels, e.g. the linux-sunxi 3.4 kernels. For now this just forces the pll5
"p" value to 1 (divide by 2) as that is what those kernels are hardcoded too,
in the future this may enable further workarounds.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Tom Rini <trini@ti.com>
--
Changes in v2:
-s/CONFIG_OLD_KERNEL_COMPAT/CONFIG_OLD_SUNXI_KERNEL_COMPAT.
-Move the code block setting P(1) for old kernels to where P gets cleared
-rw-r--r-- | arch/arm/cpu/armv7/sunxi/dram.c | 4 | ||||
-rw-r--r-- | board/sunxi/Kconfig | 7 |
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/sunxi/dram.c b/arch/arm/cpu/armv7/sunxi/dram.c index 0cbcf57..3cf3cbf 100644 --- a/arch/arm/cpu/armv7/sunxi/dram.c +++ b/arch/arm/cpu/armv7/sunxi/dram.c @@ -262,6 +262,10 @@ static void mctl_setup_dram_clock(u32 clk, u32 mbus_clk) reg_val &= ~CCM_PLL5_CTRL_K_MASK; /* set K to 0 (x1) */ reg_val &= ~CCM_PLL5_CTRL_N_MASK; /* set N to 0 (x0) */ reg_val &= ~CCM_PLL5_CTRL_P_MASK; /* set P to 0 (x1) */ +#ifdef CONFIG_OLD_SUNXI_KERNEL_COMPAT + /* Old kernels are hardcoded to P=1 (divide by 2) */ + reg_val |= CCM_PLL5_CTRL_P(1); +#endif if (clk >= 540 && clk < 552) { /* dram = 540MHz */ reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(2)); diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig index 449c046..31a1503 100644 --- a/board/sunxi/Kconfig +++ b/board/sunxi/Kconfig @@ -20,6 +20,13 @@ config SYS_SOC config FDTFILE string "Default fdtfile env setting for this board" +config OLD_SUNXI_KERNEL_COMPAT + boolean "Enable workarounds for booting old kernels" + default n + ---help--- + Set this to enable various workarounds for old kernels, this results in + sub-optimal settings for newer kernels, only enable if needed. + config MMC0_CD_PIN string "Card detect pin for mmc0" default "" |