Hi,
have you ever managed to get UART10 running from uboot / SPL? I’m also
trying to switch from UART3 to UART10. While it works fine after kernel got
started it does not from uboot…
BR,
Mica
Am Samstag, 3. Juni 2017 20:53:31 UTC+2 schrieb Jeff Andich:
>
> Hi,
>
> On the BeagleBone-X15/572xEVM, I'm attempting to switch both the SPL and
> U-boot console ports from UART3 to UART10, but thus far no luck. Per the
> 5728 DS, UART3 and UART10 can each be tied to the same pad depending on the
> mux mode. I'm Baselined on SPL/u-boot version 2017.01-00302-gafb742e.
>
> The console is still accessible, but "coninfo" returns base address for
> UART3 (serial@48020000 00000003 IO stdin stdout stderr). After changing
> the pad io conf and attempting to disable UART3, it still looks like the
> console is on UART 3! Also UART 10 is on a different L4 I.C., L4_WKUP than
> the other UARTS, L4_PER.. Not sure if this matters.
>
>
> Thus far, implemented the following changes. What am I missing or what is
> a good source of documentation to help me better understand what I'm
> missing? Thanks in advance !!
>
>
> => ../board/ti/am57xx/mux_data.h - changed the muxmode for signals
> UART2_CTSN, UART2_RTSN both to M4 for UART 10 txd/rxd).
>
> => ../board/ti/am57xx/Kconfig:
> Changed CONS_INDEX range FROM 1..6 TO 1...10
> Changed CONS_INDEX default FROM 3 TO 10
> Added #define CONFIG_SYS_NS16550_COM10 UART10_BASE
>
> => ..spl/u-boot.cfg:
> now indicates ... CONFIG_CONS_INDEX 10
>
> => ../arch/arm/include/asm/arch-omap5/omap.h: #define UART10_BASE
> (OMAP54XX_L4_WKUP_BASE + 0x2b000) .. ditto for ../asm/arch/omap.h
>
> => ../include/configs/am57xx_evm.h:
> Changed CONSOLEDEV FROM ttyO2 TO ttyO9
>
> => To structure, prcm_regs, added the element, u32
> cm_wkupaon_uart10_clkctrl ,
>
> => To .../omap5/prcm-regs.c, added the following to initializer for
> dra7xx_prcm
> /* l4 wkup regs */
> .cm_wkupaon_uart10_clkctrl = 0x4ae07880.
>
> => ..arch/arm/mach-omap2/Clocks-common.c:: setup_clocks_for_console()
> Added
>
> clrsetbits_le32((*prcm)->cm_wkupaon_uart10_clkctrl,
>
> MODULE_CLKCTRL_MODULEMODE_MASK,
>
> MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
>
> MODULE_CLKCTRL_MODULEMODE_SHIFT);
>
>
> ==> ../arch/arm/mach-omap2/omap5/hw_data.c:: enable_basic_clocks()
>
>
> In clk_modules_explicit_en_essential[]= {
>
>
> Replaced the entry
>
> (*prcm)->cm_l4per_uart3_clkctrl
>
> with
>
> (*prcm)->cm_wkupaon_uart10_clkctrl
>
>
> ==> ../arch/arm/dts/am57xx-beagle-x15-common.dtsi
>
>
> Commented out:
>
> &uart3 {
>
> status = "okay";
>
> interrupts-extended = <&crossbar_mpu GIC_SPI 69
> IRQ_TYPE_LEVEL_HIGH>,
>
> <&dra7_pmx_core 0x3f8>;
>
> };
>
>
> ==> ../arch/arm/dts/am57xx-evm-reva3.dts
>
> Added:
>
> &uart10 {
>
> status = "okay";
>
> interrupts-extended = <&crossbar_mpu GIC_SPI 69
> IRQ_TYPE_LEVEL_HIGH>,
>
> <&dra7_pmx_core 0x3f8>;
>
> };
>
>
> I'm not sure yet if u-boot also reads the device tree to determine what
> peripherals to enable...
>
>
> Thanks!!
>
>
>
>
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