AM4377: Changing debug UART

Dear Kemal:

We want to make it in u-boot.

we follow the thread to modify u-boot.
it does't work.
and the example is for am33xx, in menconfig, you can select console index,
but in the am437x, there is no the option to select console index.

can you help to compile u-boot to generate a MLO and u-boot.img with UART3 as console ?
with the MLO, i can try my board first.

Thank you very much !

Dear Kemal:
In my SDK, we can't find file arch/arm/cpu/armv7/am33xx/clock_am43xx.c
under directory arch/arm/cpu/armv7, there is no directory am33xx.
why ?

Dear Kemal:

We have follow your advice to modify the u-boot.
but it still can't work with UART3 as console.

we don't know the root cause .

Dear Kemal:
We try all the post.

It still does't work.

Dear Kemal:

         Yes. We have modify it to stdout-path = &uart3;

Hi kemal:
When I modify the clock enable for the uart3, it will show following error. Does the uart3 don't need to wkup?

In file included from arch/arm/mach-omap2/am33xx/clock_am43xx.c:17:0:
arch/arm/mach-omap2/am33xx/clock_am43xx.c: In function 'setup_clocks_for_console':
arch/arm/mach-omap2/am33xx/clock_am43xx.c:77:25: error: 'struct cm_wkuppll' has no member named 'wkup_uart4ctrl'; did you mean 'wkup_uart0ctrl'?
clrsetbits_le32(&cmwkup->wkup_uart4ctrl,
^
./arch/arm/include/asm/io.h:78:55: note: in definition of macro '__arch_putl'
#define __arch_putl(v,a) (*(volatile unsigned int *)(a) = (v))
^
./arch/arm/include/asm/io.h:175:35: note: in expansion of macro '__raw_writel'
#define out_arch(type,endian,a,v) __raw_write##type(cpu_to_##endian(v),a)
^~~~~~~~~~~
./arch/arm/include/asm/io.h:179:23: note: in expansion of macro 'out_arch'
#define out_le32(a,v) out_arch(l,le32,a,v)
^~~~~~~~
./arch/arm/include/asm/io.h:202:2: note: in expansion of macro 'out_le32'
out_##type((addr), (in_##type(addr) & ~(clear)) | (set))
^~~~
./arch/arm/include/asm/io.h:210:43: note: in expansion of macro 'clrsetbits'
#define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
^~~~~~~~~~
arch/arm/mach-omap2/am33xx/clock_am43xx.c:77:2: note: in expansion of macro 'clrsetbits_le32'
clrsetbits_le32(&cmwkup->wkup_uart4ctrl,
^~~~~~~~~~~~~~~
arch/arm/mach-omap2/am33xx/clock_am43xx.c:77:25: error: 'struct cm_wkuppll' has no member named 'wkup_uart4ctrl'; did you mean 'wkup_uart0ctrl'?
clrsetbits_le32(&cmwkup->wkup_uart4ctrl,
^
./arch/arm/include/asm/io.h:78:61: note: in definition of macro '__arch_putl'
#define __arch_putl(v,a) (*(volatile unsigned int *)(a) = (v))
^
./arch/arm/include/asm/io.h:175:35: note: in expansion of macro '__raw_writel'
#define out_arch(type,endian,a,v) __raw_write##type(cpu_to_##endian(v),a)
^~~~~~~~~~~
include/linux/byteorder/generic.h:89:21: note: in expansion of macro '__cpu_to_le32'
#define cpu_to_le32 __cpu_to_le32
^~~~~~~~~~~~~
./arch/arm/include/asm/io.h:179:23: note: in expansion of macro 'out_arch'
#define out_le32(a,v) out_arch(l,le32,a,v)
^~~~~~~~
./arch/arm/include/asm/io.h:202:2: note: in expansion of macro 'out_le32'
out_##type((addr), (in_##type(addr) & ~(clear)) | (set))
^~~~
include/linux/byteorder/generic.h:90:21: note: in expansion of macro '__le32_to_cpu'
#define le32_to_cpu __le32_to_cpu
^~~~~~~~~~~~~
./arch/arm/include/asm/io.h:133:25: note: in expansion of macro '__arch_getl'
#define __raw_readl(a) __arch_getl(a)
^~~~~~~~~~~
./arch/arm/include/asm/io.h:176:49: note: in expansion of macro '__raw_readl'
#define in_arch(type,endian,a) endian##_to_cpu(__raw_read##type(a))
^~~~~~~~~~
./arch/arm/include/asm/io.h:183:20: note: in expansion of macro 'in_arch'
#define in_le32(a) in_arch(l,le32,a)
^~~~~~~
./arch/arm/include/asm/io.h:202:22: note: in expansion of macro 'in_le32'
out_##type((addr), (in_##type(addr) & ~(clear)) | (set))
^~~
./arch/arm/include/asm/io.h:210:43: note: in expansion of macro 'clrsetbits'
#define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
^~~~~~~~~~
arch/arm/mach-omap2/am33xx/clock_am43xx.c:77:2: note: in expansion of macro 'clrsetbits_le32'
clrsetbits_le32(&cmwkup->wkup_uart4ctrl,
^~~~~~~~~~~~~~~
arch/arm/mach-omap2/am33xx/clock_am43xx.c:85:26: error: 'struct cm_wkuppll' has no member named 'wkup_uart4ctrl'; did you mean 'wkup_uart0ctrl'?
clkctrl = readl(&cmwkup->wkup_uart4ctrl);
^
./arch/arm/include/asm/io.h:73:54: note: in definition of macro '__arch_getl'
#define __arch_getl(a) (*(volatile unsigned int *)(a))

Hi kemal:
I following the instruction about which you attached the link to config uart5. And config all the files which described, and the uart3 can not work as well. Does the rtsn and ctsn will influence the output of uart3? because I didn't config them in mux.c, only config rx and tx.

Hi kemal:
How can setting the "CONFIG_SYS_EXTRA_OPTIONS="CONS_INDEX=XXXX,NAND" in the "am43xx_evm_defconfig"?
should the parameter 'CONS_INDEX' 3 or 4?

Hi kemal:
Thanks for your help, the only forget modify is the uart0 in the file "am437x-gp-evm-u-boot.dtsi", the MLO can boot up, but the uboot stage no anything output.

U-Boot SPL 2017.01-00458-gccd1c34-dirty (May 03 2018 - 18:36:26)
Trying to boot from MMC1
SPL: Please implement spl_start_uboot() for your board
SPL: Direct Linux boot not active!
reading u-boot.img
reading u-boot.img
reading u-boot.img
reading u-boot.img

Hi Kemal:
I fixed the uboot stage, thanks for your help indeed.