Djam/u-boot
1
0
Fork 0
mirror of https://github.com/u-boot/u-boot.git synced 2025-04-11 07:24:46 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

cmd: cpu: add release subcommand

Browse source 
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>
This commit is contained in:
Hou Zhiqiang 2024-08-01 11:59:55 +08:00 • committed by Fabio Estevam
parent 8a73b5b680
commit 476fb4d8ea
1 changed files with 42 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

44
cmd/cpu.c
View file

@ -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));