This command allows to start CDC ACM function and redirect console (stdin, stdout, stderr) to USB (acmconsole start). The console can then be accessed through the USB host for debugging purpose. The host can stop the session (acmconsole stop) to revert back console to serial and unregister CDC ACM USB function.
Signed-off-by: Loic Poulain loic.poulain@linaro.org --- cmd/Kconfig | 8 ++++++++ cmd/Makefile | 2 ++ cmd/acmconsole.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 60 insertions(+) create mode 100644 cmd/acmconsole.c
diff --git a/cmd/Kconfig b/cmd/Kconfig index ffef3cc..7cc9b1c 100644 --- a/cmd/Kconfig +++ b/cmd/Kconfig @@ -1382,6 +1382,14 @@ config CMD_AXI Interface) busses, a on-chip interconnect specification for managing functional blocks in SoC designs, which is also often used in designs involving FPGAs (e.g. communication with IP cores in Xilinx FPGAs). + +config CMD_USB_ACM_CONSOLE + bool "ACM USB console" + select USB_FUNCTION_ACM + help + Enable the command "acmconsole" for accessing u-boot console from a + USB host through CDC ACM protocol. + endmenu
diff --git a/cmd/Makefile b/cmd/Makefile index ed36694..c116091 100644 --- a/cmd/Makefile +++ b/cmd/Makefile @@ -34,6 +34,7 @@ obj-$(CONFIG_CMD_BOOTMENU) += bootmenu.o obj-$(CONFIG_CMD_BOOTSTAGE) += bootstage.o obj-$(CONFIG_CMD_BOOTZ) += bootz.o obj-$(CONFIG_CMD_BOOTI) += booti.o +ob-y += acmconsole.o obj-$(CONFIG_CMD_BTRFS) += btrfs.o obj-$(CONFIG_CMD_BUTTON) += button.o obj-$(CONFIG_CMD_CACHE) += cache.o @@ -174,6 +175,7 @@ obj-$(CONFIG_CMD_FS_UUID) += fs_uuid.o obj-$(CONFIG_CMD_USB_MASS_STORAGE) += usb_mass_storage.o obj-$(CONFIG_CMD_USB_SDP) += usb_gadget_sdp.o obj-$(CONFIG_CMD_THOR_DOWNLOAD) += thordown.o +obj-$(CONFIG_CMD_USB_ACM_CONSOLE) += acmconsole.o obj-$(CONFIG_CMD_XIMG) += ximg.o obj-$(CONFIG_CMD_YAFFS2) += yaffs2.o obj-$(CONFIG_CMD_SPL) += spl.o diff --git a/cmd/acmconsole.c b/cmd/acmconsole.c new file mode 100644 index 0000000..dac8136 --- /dev/null +++ b/cmd/acmconsole.c @@ -0,0 +1,50 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * acmconsole.c -- Console over USB CDC serial (ACM) function gadget function + * + * Copyright (c) 2021, Linaro Ltd loic.poulain@linaro.org + */ + +#include <common.h> +#include <console.h> +#include <dfu.h> +#include <g_dnl.h> +#include <stdio_dev.h> +#include <usb.h> +#include <watchdog.h> + +int do_usb_acmconsole(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + int ret; + + if (argc != 2) + return CMD_RET_USAGE; + + if (!strcmp(argv[1], "start")) { + ret = g_dnl_register("usb_serial_acm"); + if (ret) + return ret; + + /* ACM function creates a stdio device name 'stdio_acm' */ + console_assign(stdin, "stdio_acm"); + console_assign(stdout, "stdio_acm"); + console_assign(stderr, "stdio_acm"); + } else if (!strcmp(argv[1], "stop")) { + /* default to serial (TODO: restore initial devices) */ + console_assign(stdin, "serial"); + console_assign(stdout, "serial"); + console_assign(stderr, "serial"); + + g_dnl_unregister(); + g_dnl_clear_detach(); + } else { + return CMD_RET_USAGE; + } + + return 0; +} + +U_BOOT_CMD(acmconsole, CONFIG_SYS_MAXARGS, 1, do_usb_acmconsole, + "Console over USB CDC ACM", + "start - start console over USB CDC ACM gadget function\n" \ + "acmconsole stop - stop USB console");