The CONFIG_UART0_PORT_F option has been supported since http://git.denx.de/?p=u-boot.git;a=commit;h=ff2b47f6a9cc1025
This option is primarily useful only for low level u-boot debugging on tablets, where normal UART0 is difficult to access and requires device disassembly and/or soldering.
This patch now allows it to be selected from menuconfig. A dependency on SPL_FEL is added because u-boot does not support booting from NAND yet and also booting from SD card is impossible when a MicroSD breakout board is plugged into the SD slot.
Additionally a compilation problem is fixed:
common/spl/built-in.o: In function `spl_mmc_load_image': /tmp/u-boot-sunxi/common/spl/spl_mmc.c:94: undefined reference to `mmc_initialize' /tmp/u-boot-sunxi/common/spl/spl_mmc.c:96: undefined reference to `find_mmc_device' /tmp/u-boot-sunxi/common/spl/spl_mmc.c:104: undefined reference to `mmc_init' scripts/Makefile.spl:206: recipe for target 'spl/u-boot-spl' failed
Signed-off-by: Siarhei Siamashka siarhei.siamashka@gmail.com --- board/sunxi/Kconfig | 12 ++++++++++++ include/configs/sunxi-common.h | 3 +++ 2 files changed, 15 insertions(+)
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig index 5a88ba0..7140b80 100644 --- a/board/sunxi/Kconfig +++ b/board/sunxi/Kconfig @@ -178,6 +178,18 @@ config SPL_FEL depends on SPL default n
+config UART0_PORT_F + bool "UART0 on MicroSD breakout board" + depends on SPL_FEL + default n + ---help--- + Repurpose the SD card slot for getting access to the UART0 serial + console. Primarily useful only for low level u-boot debugging on + tablets, where normal UART0 is difficult to access and requires + device disassembly and/or soldering. As the SD card can't be used + at the same time, the system can be only booted in the FEL mode. + Only enable this if you really know what you are doing. + config FDTFILE string "Default fdtfile env setting for this board"
diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h index 3f890b2..f7e87a2 100644 --- a/include/configs/sunxi-common.h +++ b/include/configs/sunxi-common.h @@ -160,7 +160,10 @@ #define CONFIG_SPL_MAX_SIZE 0x5fe0 /* 24KB on sun4i/sun7i */
#define CONFIG_SPL_LIBDISK_SUPPORT + +#if !defined(CONFIG_UART0_PORT_F) #define CONFIG_SPL_MMC_SUPPORT +#endif
#define CONFIG_SPL_LDSCRIPT "arch/arm/cpu/armv7/sunxi/u-boot-spl.lds"