On Mon, Apr 9, 2018 at 6:50 PM, JunBeom Kim (EmbedCoreTech) < jb...@e-coretech.kr> wrote:
> Dear Sir, > > Is there RTEMS users for running RTEMS for PICO-PI-IMX7 board ? > > I purchased PICO-PI-IMX7 from Wanboard. > https://www.wandboard.org/products/android-things/PICO-PI-IMX7/ > > I am tring to test RTEMS on PICO-PI-IMX7 using RTEMS current version for > i.MX7D SDB board. > Ooooh, this is a sexy little kit... https://www.variscite.com/products/system-on-module-som/cortex-a7/var-som-mx7-nxp-freescale-imx-7/ > > On referencing, when I check PICO-PI-IMX7 board, there is u-boot only. > Also, there is eMMC memory only. (It was headache in first) > Therefore, I needed additional work for writing your modified u-boot > and/or for preparing RTEMS image FAT32 storage. Additional work means that > u-boot writing by dd command and eMMC partition configuration by fdisk > command after Linux kernel is booting. > > At this time, I removed Linux kernel image on eMMC storage and I am ready > to test RTEMS image only. > Also, If user use "ums 0 mmc 0" command in u-boot, user can replace RTEMS > image and dtb file easily on PC(Windows or Linux Desktop). > > As I check difference between PICO-PI-IMX7 and i.MX7D SDB, UART debug port > number is different. > - PICO-PI-IMX7 : UART5 (serial4) > - i.MX7D SDB : UART1 (serial0) > > After I check current RTEMS bsp source, I modified console-config.c due to > UART port number change in below; > > < Original code : for UART1 debug port > > static imx_uart_context imx_uart_instances[7]; > static imx_uart_context *imx_uart_console = &imx_uart_instances[0]; > > < Modified code : for UART5 debug port > > static imx_uart_context imx_uart_instances[7]; > static imx_uart_context *imx_uart_console = &imx_uart_instances[4]; > > Even though I modified this, there is not any output after running RTEMS. > > I am checking UART configuration by FDT. > > As I check imx_uart_probe() function of console-config.c, there is > "chosen" and "stdout-path" keyword in below; > > static void imx_uart_probe(void) > { > const void *fdt; > int node; > int offset; > const char *console; > size_t i; > > fdt = bsp_fdt_get(); > node = fdt_path_offset(fdt, "/chosen"); > > console = fdt_getprop(fdt, node, "stdout-path", NULL); > if (console == NULL) { > console = ""; > } > ... > } > > I think that there should be declaration for "stdout-path" of "chosen" > area in dts(including dtsi) source file. > > As I check dts files on lastest Linux kernel for both i.MX7D SDB and > PICO-IMX7, there is not "stdout-path" information of "chosen". > > I attached files related with this. > > - i.MX7D SDB : imx7d-sdb.dts with imx7d.dtsi, imx7s.dtsi > - PICO-IMX7 : imx7d-pico-pi.dts with imx7d-pico.dtsi, imx7d.dtsi, > imx7s.dtsi > > Because there is blank information for "chosen" in imx7s.dtsi, I added > "stdout-path" in imx7d-pico-dtsi. > > < imx7s.dtsi > > / { > #address-cells = <1>; > #size-cells = <1>; > /* > * The decompressor and also some bootloaders rely on a > * pre-existing /chosen node to be available to insert the > * command line and merge other ATAGS info. > * Also for U-Boot there must be a pre-existing /memory node. > */ > chosen {}; ==> "there is not any information for stdout-path" > memory { device_type = "memory"; }; > ... > } > > < My modified imx7d-pico.dtsi > > > / { > model = "Technexion Pico i.MX7D Board"; > compatible = "technexion,imx7d-pico", "fsl,imx7d"; > > memory@80000000 { > reg = <0x80000000 0x80000000>; > }; > > chosen { > stdout-path = &uart5"; ==> "I added stdout-path > information". > }; > > ... > } > > After I modified imx7d-pico.dtsi, I made imx7d-pico-pi.dtb. > > Finally, I tried to run RTEMS using the revised dtb file. But, there is > not any serial output. > > On referencing, there is not JTAG debug port in PICO board, It is very > difficult to debug current RTEMS for i.MX7D. > > If there is mistake in my trial step, please let me know that. > > Best Regards, > JunBeom Kim > ~~~~~~~~~~~~~~~~~~~~~~ > President / EmbedCoreTech > Phone: +82-31-396-5584 > Fax: +82-504-065-5720 > Mobile:+82-10-6425-5720 > Email: jb...@e-coretech.kr > Web: www.e-coretech.kr > ~~~~~~~~~~~~~~~~~~~~~~ > > > > _______________________________________________ > users mailing list > users@rtems.org > http://lists.rtems.org/mailman/listinfo/users >
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