On 22/08/25 20:17, Tom Rini wrote:
On Fri, Aug 22, 2025 at 09:35:23AM +0530, vishnu singh wrote:
From: Vishnu Singh <[email protected]>
U-Boot now stashes its bootstage buffer into a reserved memory region
whenever CONFIG_BOOTSTAGE_STASH is enabled, just before exiting to the
kernel. This allows a post boot parser to read a unified timeline
(SPL→U-Boot→Kernel→MCU/DSP) directly from DDR, enabling standardized
and repeatable boot-time profiling across releases and SoCs.
Change summary:
Call bootstage_stash_default() in announce_and_cleanup()
when CONFIG_BOOTSTAGE_STASH is set.
Reference boot-time parser utility:
https://github.com/v-singh1/boot-time-parse
Sample boot time report:
+--------------------------------------------------------------------+
am62xx-evm Boot Time Report
+--------------------------------------------------------------------+
Device Power On : 0 ms
SPL Time : 843 ms
U-Boot Time : 2173 ms
Kernel handoff time : 462 ms
Kernel Time : 2522 ms
Total Boot Time : 6000 ms
+--------------------------------------------------------------------+
+--------------------------------------------------------------------+
Bootloader and Kernel Boot Records
+--------------------------------------------------------------------+
BOOTSTAGE_AWAKE = 0 ms (+ 0 ms)
BOOTSTAGE_START_UBOOT_F = 843 ms (+ 0 ms)
BOOTSTAGE_ACCUM_DM_F = 843 ms (+ 0 ms)
BOOTSTAGE_START_UBOOT_R = 1951 ms (+1108 ms)
BOOTSTAGE_ACCUM_DM_R = 1951 ms (+ 0 ms)
BOOTSTAGE_NET_ETH_START = 2032 ms (+ 81 ms)
BOOTSTAGE_NET_ETH_INIT = 2053 ms (+ 21 ms)
BOOTSTAGE_MAIN_LOOP = 2055 ms (+ 2 ms)
BOOTSTAGE_START_MCU = 2661 ms (+606 ms)
BOOTSTAGE_BOOTM_START = 2959 ms (+298 ms)
BOOTSTAGE_RUN_OS = 3016 ms (+ 57 ms)
BOOTSTAGE_BOOTM_HANDOFF = 3016 ms (+ 0 ms)
BOOTSTAGE_KERNEL_START = 3478 ms (+462 ms)
BOOTSTAGE_KERNEL_END = 6000 ms (+2522 ms)
+--------------------------------------------------------------------+
+--------------------------------------------------------------------+
MCU Boot Records
+--------------------------------------------------------------------+
MCU_AWAKE = 2661 ms (+ 0 ms)
BOARD_PERIPHERALS_INIT = 2661 ms (+ 0 ms)
MAIN_TASK_CREATE = 2661 ms (+ 0 ms)
FIRST_TASK = 2662 ms (+ 1 ms)
DRIVERS_OPEN = 2662 ms (+ 0 ms)
BOARD_DRIVERS_OPEN = 2662 ms (+ 0 ms)
IPC_SYNC_FOR_LINUX = 6636 ms (+3974 ms)
IPC_REGISTER_CLIENT = 6636 ms (+ 0 ms)
IPC_SUSPEND_TASK = 6636 ms (+ 0 ms)
IPC_RECEIVE_TASK = 6636 ms (+ 0 ms)
IPC_SYNC_ALL = 6787 ms (+151 ms)
+--------------------------------------------------------------------+
Signed-off-by: Vishnu Singh <[email protected]>
In that it looks like x86 already does a similar thing, this is a good
idea and I wonder if some tooling already exists to read it.
---
arch/arm/lib/bootm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index 7eb764e1f4e..b01e763ff28 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -57,6 +57,9 @@ static void announce_and_cleanup(int fake)
#ifdef CONFIG_BOOTSTAGE_FDT
bootstage_fdt_add_report();
#endif
+ if (IS_ENABLED(CONFIG_BOOTSTAGE_STASH))
+ bootstage_stash_default();
You don't need to guard the call, the default bootstage_stash_default()
is a return 0 call when CONFIG_BOOTSTAGE_STASH isn't set.
Will update and send the patch
