Hi Simon,
On 16/03/23 10:10, Nikhil M Jain wrote:
Hi Simon,
On 15/03/23 19:38, Simon Glass wrote:
Hi Nikhil,
On Wed, 15 Mar 2023 at 00:07, Nikhil M Jain <n-ja...@ti.com> wrote:
Hi Simon,
On 15/03/23 03:38, Simon Glass wrote:
Hi Nikhil,
On Mon, 13 Mar 2023 at 04:15, Nikhil M Jain <n-ja...@ti.com> wrote:
To enable splash screen at SPL stage move video driver and splash
screen
framework at SPL, which will bring up image on display very quickly
and
thus have early display support in SPL.
Nikhil M Jain (9):
drivers: video: Kconfig: Necessary configs for video at SPL
drivers: video: tidss: Kconfig: Configs to enable TIDSS at SPL
cmd: Kconfig: Add necessary configs for splash screen at SPL
drivers: video: Makefile: Compile video driver files at SPL
drivers: video: tidss: Makefile: Add condition to compile TIDSS
at SPL
cmd: Makefile: Add rules to build bmp.c and read.c at SPL
common: splash: Enable splash_display at SPL stage
drivers: video: video-uclass: Disable u-boot logo at SPL
board: ti: am62x: evm: OSPI support for splash screen
board/ti/am62x/evm.c | 6 ++++++
cmd/Kconfig | 17 +++++++++++++++++
cmd/Makefile | 2 ++
common/splash.c | 2 +-
drivers/video/Kconfig | 32 ++++++++++++++++++++++++++++----
drivers/video/Makefile | 6 ++++++
drivers/video/tidss/Kconfig | 6 ++++++
drivers/video/tidss/Makefile | 1 +
drivers/video/video-uclass.c | 2 +-
include/splash.h | 2 +-
10 files changed, 69 insertions(+), 7 deletions(-)
I'm not necessarily arguing against this, but what is the need for
this? How many milliseconds earlier does the image appear with this
patch? What is the bottleneck? We should be able to get to U-Boot
proper very quickly.
There is a significant difference in time, by adding support in SPL
splash screen comes up by approx 650ms and at u-boot proper it comes at
2.6s, measured from first print in console as seen on AM62x. Also we
plan to skip u-boot proper and load kernel directly.
Yes that really is terrible. It should be under a second for U-Boot
proper!
Have you tried using bootstage to report the numbers?
No I haven't used the bootstage, I will use it to get the numbers.
Boot stage logs
link: https://gist.github.com/NikMJain/beb60fe42b1e89829cdd5b8713284330
Have you tried using tracing to figure out what is wrong? Is it just
slow storage?
U-boot proper comes up in one sec but the splash display is called
through stdio_add_devices which is late in the board_init_r sequence
defined in board_r.c.
>> Regards,
Simon
Thanks
On AM62x we have multi-stage boot first R5 SPL comes up then A53 SPL and
u-boot proper, due to which splash screen at u-boot proper takes over 2
sec. On AM62x we have an aggressive requirement for an early splash
screen. Hence we are moving splash screen support to SPL., which will
bring splash screen time to approx 600 ms.
We also want to support falcon boot mode from A53 SPL, we have customers
who don't want u-boot proper in production boot flow and still require
splash screen, the only way to support it is to add splash screen at SPL.
u-boot logs with splash screen timings, measurement through
timer_get_boot_us at u-boot proper and SPL.
link: https://gist.github.com/NikMJain/3be0b6c92092678b6aec8e5fdbc46a98
Thanks,
Nikhil
