[OpenWrt-Devel] [PATCH v2 1/3] mcs814x: fix debug UART

[Florian Fainelli]

On Jul 27, 2015 3:54 AM, "Günther Kelleter" <guenther.kelleter at devolo.de>
wrote:
>
> It was broken since kernel 3.14

True, but your patch does not explain how you are fixing this, which is
what matters for a good commit message. Could expand on why migrating to
the generic 8250 debug uart code is fixing things?

>
> Signed-off-by: Günther Kelleter <guenther.kelleter at devolo.de>
> ---
>  target/linux/mcs814x/config-3.18                   | 10 ++++--
>  .../linux/mcs814x/patches-3.18/014-debuguart.patch | 41
++++++++++++++++++++++
>  2 files changed, 48 insertions(+), 3 deletions(-)
>  create mode 100644 target/linux/mcs814x/patches-3.18/014-debuguart.patch
>
> diff --git a/target/linux/mcs814x/config-3.18
b/target/linux/mcs814x/config-3.18
> index 87a8382..e57f5ff 100644
> --- a/target/linux/mcs814x/config-3.18
> +++ b/target/linux/mcs814x/config-3.18
> @@ -49,10 +49,15 @@ CONFIG_CRYPTO_CRC32C=y
>  CONFIG_CRYPTO_HASH=y
>  CONFIG_CRYPTO_HASH2=y
>  CONFIG_DEBUG_LL=y
> -CONFIG_DEBUG_LL_INCLUDE="mach/debug-macro.S"
> +CONFIG_DEBUG_LL_INCLUDE="debug/8250.S"
>  CONFIG_DEBUG_LL_UART_NONE=y
> -# CONFIG_DEBUG_UART_8250 is not set
> +CONFIG_DEBUG_UART_8250=y
> +# CONFIG_DEBUG_UART_8250_FLOW_CONTROL is not set
> +CONFIG_DEBUG_UART_8250_SHIFT=2
> +# CONFIG_DEBUG_UART_8250_WORD is not set
> +CONFIG_DEBUG_UART_PHYS=0x400dc000
>  # CONFIG_DEBUG_UART_PL01X is not set
> +CONFIG_DEBUG_UART_VIRT=0xf00dc000
>  # CONFIG_DEBUG_USER is not set
>  CONFIG_DTC=y
>  CONFIG_EARLY_PRINTK=y
> @@ -157,7 +162,6 @@ CONFIG_MTD_PHYSMAP=y
>  CONFIG_MULTI_IRQ_HANDLER=y
>  CONFIG_NEED_DMA_MAP_STATE=y
>  CONFIG_NEED_KUSER_HELPERS=y
> -CONFIG_NEED_MACH_MEMORY_H=y
>  CONFIG_NEED_PER_CPU_KM=y
>  CONFIG_NET_KEY=y
>  # CONFIG_NET_VENDOR_BROADCOM is not set
> diff --git a/target/linux/mcs814x/patches-3.18/014-debuguart.patch
b/target/linux/mcs814x/patches-3.18/014-debuguart.patch
> new file mode 100644
> index 0000000..5f1b67f
> --- /dev/null
> +++ b/target/linux/mcs814x/patches-3.18/014-debuguart.patch
> @@ -0,0 +1,41 @@
> +--- a/arch/arm/mach-mcs814x/include/mach/debug-macro.S
> ++++ /dev/null
> +@@ -1,11 +0,0 @@
> +-#include <mach/mcs814x.h>
> +-
> +-                .macro  addruart, rp, rv, tmp
> +-              ldr     \rp, =MCS814X_PHYS_BASE
> +-              ldr     \rv, =MCS814X_VIRT_BASE
> +-              orr     \rp, \rp, #MCS814X_UART
> +-              orr     \rv, \rv, #MCS814X_UART
> +-                .endm
> +-
> +-#define UART_SHIFT    2
> +-#include <asm/hardware/debug-8250.S>
> +--- a/arch/arm/Kconfig.debug
> ++++ b/arch/arm/Kconfig.debug
> +@@ -1089,7 +1089,7 @@ config DEBUG_UART_8250
> +               (FOOTBRIDGE && !DEBUG_DC21285_PORT) || \
> +               ARCH_GEMINI || ARCH_IOP13XX || ARCH_IOP32X || \
> +               ARCH_IOP33X || ARCH_IXP4XX || \
> +-              ARCH_LPC32XX || ARCH_MV78XX0 || ARCH_ORION5X || ARCH_RPC
> ++              ARCH_LPC32XX || ARCH_MCS814X || ARCH_MV78XX0 ||
ARCH_ORION5X || ARCH_RPC
> +
> + # Compatibility options for BCM63xx
> + config DEBUG_UART_BCM63XX
> +@@ -1124,6 +1124,7 @@ config DEBUG_UART_PHYS
> +       default 0x3e000000 if DEBUG_BCM_KONA_UART
> +       default 0x4000e400 if DEBUG_LL_UART_EFM32
> +       default 0x40090000 if ARCH_LPC32XX
> ++      default 0x400dc000 if ARCH_MCS814X
> +       default 0x40100000 if DEBUG_PXA_UART1
> +       default 0x42000000 if ARCH_GEMINI
> +       default 0x50000000 if DEBUG_S3C24XX_UART && (DEBUG_S3C_UART0 || \
> +@@ -1178,6 +1179,7 @@ config DEBUG_UART_VIRT
> +       default 0xe0010fe0 if ARCH_RPC
> +       default 0xe1000000 if DEBUG_MSM_UART
> +       default 0xf0000be0 if ARCH_EBSA110
> ++      default 0xf00dc000 if ARCH_MCS814X
> +       default 0xf01fb000 if DEBUG_NOMADIK_UART
> +       default 0xf0201000 if DEBUG_BCM2835
> +       default 0xf1000300 if DEBUG_BCM_5301X
> --
> 2.4.6.89.g851dcf4
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