From: Hou Zhiqiang Zhiqiang.Hou@nxp.com
Add a new subcommand 'release' to bring up a core to run baremetal and RTOS applications.
For example on i.MX8M Plus EVK, release the LAST core to run a RTOS application, passing the sequence number of the CPU core to release, here it is 3: u-boot=> cpu list 0: cpu@0 NXP i.MX8MP Rev1.1 A53 at 1200 MHz at 31C 1: cpu@1 NXP i.MX8MP Rev1.1 A53 at 1200 MHz at 30C 2: cpu@2 NXP i.MX8MP Rev1.1 A53 at 1200 MHz at 31C 3: cpu@3 NXP i.MX8MP Rev1.1 A53 at 1200 MHz at 31C
u-boot=> load mmc 1:2 c0000000 /hello_world.bin 66008 bytes read in 5 ms (12.6 MiB/s) u-boot=> dcache flush; icache flush u-boot=> cpu release 3 c0000000 Released CPU core (mpidr: 0x3) to address 0xc0000000
Signed-off-by: Hou Zhiqiang Zhiqiang.Hou@nxp.com Reviewed-by: Simon Glass sjg@chromium.org --- V5: - No change.
cmd/cpu.c | 44 ++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 42 insertions(+), 2 deletions(-)
diff --git a/cmd/cpu.c b/cmd/cpu.c index 9e323069b9..2755250756 100644 --- a/cmd/cpu.c +++ b/cmd/cpu.c @@ -3,6 +3,7 @@ * Copyright (c) 2015 Google, Inc * Written by Simon Glass sjg@chromium.org * Copyright (c) 2017 Álvaro Fernández Rojas noltari@gmail.com + * Copyright 2024 NXP */
#include <command.h> @@ -18,6 +19,19 @@ static const char *cpu_feature_name[CPU_FEAT_COUNT] = { "Device ID", };
+static struct udevice *cpu_find_device(unsigned long cpu_id) +{ + struct udevice *dev; + + for (uclass_first_device(UCLASS_CPU, &dev); dev; + uclass_next_device(&dev)) { + if (cpu_id == dev_seq(dev)) + return dev; + } + + return NULL; +} + static int print_cpu_list(bool detail) { struct udevice *dev; @@ -82,10 +96,36 @@ static int do_cpu_detail(struct cmd_tbl *cmdtp, int flag, int argc, return 0; }
+static int do_cpu_release(struct cmd_tbl *cmdtp, int flag, int argc, + char *const argv[]) +{ + struct udevice *dev; + unsigned long cpu_id; + unsigned long long boot_addr; + + if (argc != 3) + return CMD_RET_USAGE; + + cpu_id = dectoul(argv[1], NULL); + dev = cpu_find_device(cpu_id); + if (!dev) + return CMD_RET_FAILURE; + + boot_addr = simple_strtoull(argv[2], NULL, 16); + + if (cpu_release_core(dev, boot_addr)) + return CMD_RET_FAILURE; + + return 0; +} + U_BOOT_LONGHELP(cpu, "list - list available CPUs\n" - "cpu detail - show CPU detail"); + "cpu detail - show CPU detail\n" + "cpu release <core ID> <addr> - Release CPU <core ID> at <addr>\n" + " <core ID>: the sequence number in list subcommand outputs");
U_BOOT_CMD_WITH_SUBCMDS(cpu, "display information about CPUs", cpu_help_text, U_BOOT_SUBCMD_MKENT(list, 1, 1, do_cpu_list), - U_BOOT_SUBCMD_MKENT(detail, 1, 0, do_cpu_detail)); + U_BOOT_SUBCMD_MKENT(detail, 1, 0, do_cpu_detail), + U_BOOT_SUBCMD_MKENT(release, 3, 0, do_cpu_release));