arm: sunxi: do not force USB for arch-sunxi
PATCH 1/1 arm: sunxi: do not force USB for arch-sunxi
Currently, USB is forced-enabled for the sunxi familly, and there is no way to disable it.
However, USB takes a long time to initiliase, delaying the boot by up to 5 seconds (without any USB device attached!). This is a very long delay, especially in cases where USB booting is not wanted at all, and where the device is expected to boot relatively often (even in production).
Change the way the dependencies are handled, by only forcibly selecting USB when CONFIG_DISTRO_DEFAULTS ("defaults suitable for booting general purpose Linux distributions") is set. This option defaults to y for the sunxi familly, so the current default behaviour is kept unchanged. Users interested in boot time and/or size will be able to disable this to further disable USB.
With USB disabled, the time spent in U-Boot before handing control to the Linux kernel is about 1s now, down from ~5s (Nanopi Neo, sunxi H3).
---
This is a tentative patch, acting as an RFC (unless it is good to go as is, of course!).
This has been discussed on IRC with <ssvb> and <apritzel>, and this solution is what emerged from the discussions as a first step.
The second step would be to defer intialisation of drivers until they are actually needed, i.e. if main boot is not from USB, then don't initiliase USB; if main boot fails, then initialise addtional drivers, like USB... Or something along those lines... That's a much tougher work for me, though...
There are other features that are currently forced like USB, but USB is by far the worst "offender" and a low-hanging fruit. Those other "offenders" can be handled in follow up changes.
--- arch/arm/Kconfig | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
arch/arm/Kconfig +5 -5
@@ -561,22 +561,22 @@ config ARCH_SUNXI bool "Support sunxi (Allwinner) SoCs" select CMD_GPIO select CMD_MMC if MMC - select CMD_USB + select CMD_USB if DISTRO_DEFAULTS select DM select DM_ETH select DM_GPIO select DM_KEYBOARD select DM_SERIAL - select DM_USB + select DM_USB if DISTRO_DEFAULTS select OF_BOARD_SETUP select OF_CONTROL select OF_SEPARATE select SPL_STACK_R if SUPPORT_SPL select SPL_SYS_MALLOC_SIMPLE if SUPPORT_SPL select SYS_NS16550 - select USB - select USB_STORAGE - select USB_KEYBOARD + select USB if DISTRO_DEFAULTS + select USB_STORAGE if DISTRO_DEFAULTS + select USB_KEYBOARD if DISTRO_DEFAULTS select USE_TINY_PRINTF config TARGET_TS4800
Signature · 1 line
2.7.4
PATCH 1/1 arm: sunxi: do not force USB for arch-sunxi
Ian, Hans, All,
On 2016-10-31 22:33 +0100, Yann E. MORIN spake thusly:
Quoted 15 lines
Currently, USB is forced-enabled for the sunxi familly, and there is no way to disable it.
However, USB takes a long time to initiliase, delaying the boot by up to 5 seconds (without any USB device attached!). This is a very long delay, especially in cases where USB booting is not wanted at all, and where the device is expected to boot relatively often (even in production).
Change the way the dependencies are handled, by only forcibly selecting USB when
CONFIG_DISTRO_DEFAULTS("defaults suitable for booting general purpose Linux distributions") is set. This option defaults to y for the sunxi familly, so the current default behaviour is kept unchanged. Users interested in boot time and/or size will be able to disable this to further disable USB.
Quoted 2 lines
With USB disabled, the time spent in U-Boot before handing control to the Linux kernel is about 1s now, down from ~5s (Nanopi Neo, sunxi H3).
Just a gentle ping... ;-)
Regards,
Yann E. MORIN.
Quoted 59 lines
Signed-off-by "Yann E. MORIN" <[email protected]>Cc Ian Campbell <[email protected]>Cc Hans De Goede <[email protected]>---
This is a tentative patch, acting as an RFC (unless it is good to go as is, of course!).This has been discussed on IRC with <ssvb> and <apritzel>, and this solution is what emerged from the discussions as a first step.
The second step would be to defer intialisation of drivers until they are actually needed, i.e. if main boot is not from USB, then don't initiliase USB; if main boot fails, then initialise addtional drivers, like USB... Or something along those lines... That's a much tougher work for me, though...
There are other features that are currently forced like USB, but USB is by far the worst "offender" and a low-hanging fruit. Those other "offenders" can be handled in follow up changes.
--- arch/arm/Kconfig | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)arch/arm/Kconfig +5
-5@@ -561,22 +561,22 @@ config ARCH_SUNXI bool "Support sunxi (Allwinner) SoCs" select CMD_GPIO select CMD_MMC if MMC - select CMD_USB + select CMD_USB if DISTRO_DEFAULTS select DM select DM_ETH select DM_GPIO select DM_KEYBOARD select DM_SERIAL - select DM_USB + select DM_USB if DISTRO_DEFAULTS select OF_BOARD_SETUP select OF_CONTROL select OF_SEPARATE select SPL_STACK_R if SUPPORT_SPL select SPL_SYS_MALLOC_SIMPLE if SUPPORT_SPL select SYS_NS16550 - select USB - select USB_STORAGE - select USB_KEYBOARD + select USB if DISTRO_DEFAULTS + select USB_STORAGE if DISTRO_DEFAULTS + select USB_KEYBOARD if DISTRO_DEFAULTS select USE_TINY_PRINTF config TARGET_TS4800Signature · 1 line
2.7.4
Signature · 6 lines
.-----------------.--------------------.------------------.--------------------. | Yann E. MORIN | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: | | +33 662 376 056 | Software Designer | \ / CAMPAIGN | ___ | | +33 223 225 172 `------------.-------: X AGAINST | \e/ There is no | | http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL | v conspiracy. | '------------------------------^-------^------------------^--------------------'
PATCH 1/1 arm: sunxi: do not force USB for arch-sunxi
Hi,
Quoted 18 lines · Yann E. MORIN
Ian, Hans, All,
On 2016-10-31 22:33 +0100, Yann E. MORIN spake thusly:
Quoted 15 lines
Currently, USB is forced-enabled for the sunxi familly, and there is no way to disable it.
However, USB takes a long time to initiliase, delaying the boot by up to 5 seconds (without any USB device attached!). This is a very long delay, especially in cases where USB booting is not wanted at all, and where the device is expected to boot relatively often (even in production).
Change the way the dependencies are handled, by only forcibly selecting USB when
CONFIG_DISTRO_DEFAULTS("defaults suitable for booting general purpose Linux distributions") is set. This option defaults to y for the sunxi familly, so the current default behaviour is kept unchanged. Users interested in boot time and/or size will be able to disable this to further disable USB.
Quoted 4 lines
Quoted 2 lines
With USB disabled, the time spent in U-Boot before handing control to the Linux kernel is about 1s now, down from ~5s (Nanopi Neo, sunxi H3).
Just a gentle ping... ;-)
10 days is a bit short in between ping times for a volunteer maintained subsys :) Anyways I've this on my todo and hopefully will get around to it soonish.
Regards,
Hans
Quoted 64 lines
Regards,
Yann E. MORIN.Quoted 59 lines
Signed-off-by "Yann E. MORIN" <[email protected]>Cc Ian Campbell <[email protected]>Cc Hans De Goede <[email protected]>---
This is a tentative patch, acting as an RFC (unless it is good to go as is, of course!).This has been discussed on IRC with <ssvb> and <apritzel>, and this solution is what emerged from the discussions as a first step.
The second step would be to defer intialisation of drivers until they are actually needed, i.e. if main boot is not from USB, then don't initiliase USB; if main boot fails, then initialise addtional drivers, like USB... Or something along those lines... That's a much tougher work for me, though...
There are other features that are currently forced like USB, but USB is by far the worst "offender" and a low-hanging fruit. Those other "offenders" can be handled in follow up changes.
--- arch/arm/Kconfig | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)arch/arm/Kconfig +5
-6@@ -561,22 +561,22 @@ config ARCH_SUNXI bool "Support sunxi (Allwinner) SoCs" select CMD_GPIO select CMD_MMC if MMC - select CMD_USB + select CMD_USB if DISTRO_DEFAULTS select DM select DM_ETH select DM_GPIO select DM_KEYBOARD select DM_SERIAL - select DM_USB + select DM_USB if DISTRO_DEFAULTS select OF_BOARD_SETUP select OF_CONTROL select OF_SEPARATE select SPL_STACK_R if SUPPORT_SPL select SPL_SYS_MALLOC_SIMPLE if SUPPORT_SPL select SYS_NS16550 - select USB - select USB_STORAGE - select USB_KEYBOARD + select USB if DISTRO_DEFAULTS + select USB_STORAGE if DISTRO_DEFAULTS + select USB_KEYBOARD if DISTRO_DEFAULTS select USE_TINY_PRINTF config TARGET_TS4800 --2.7.4
PATCH 1/1 arm: sunxi: do not force USB for arch-sunxi
Hans, All,
On 2016-11-10 20:10 +0100, Hans de Goede spake thusly:
Quoted 19 lines · Yann E. MORIN
Quoted 18 lines
Ian, Hans, All,
On 2016-10-31 22:33 +0100, Yann E. MORIN spake thusly:
Quoted 15 lines
Currently, USB is forced-enabled for the sunxi familly, and there is no way to disable it.
However, USB takes a long time to initiliase, delaying the boot by up to 5 seconds (without any USB device attached!). This is a very long delay, especially in cases where USB booting is not wanted at all, and where the device is expected to boot relatively often (even in production).
Change the way the dependencies are handled, by only forcibly selecting USB when
CONFIG_DISTRO_DEFAULTS("defaults suitable for booting general purpose Linux distributions") is set. This option defaults to y for the sunxi familly, so the current default behaviour is kept unchanged. Users interested in boot time and/or size will be able to disable this to further disable USB.
Quoted 7 lines
Quoted 4 lines
Quoted 2 lines
With USB disabled, the time spent in U-Boot before handing control to the Linux kernel is about 1s now, down from ~5s (Nanopi Neo, sunxi H3).
Just a gentle ping... ;-)
10 days is a bit short in between ping times for a volunteer maintained subsys :)
Sorry, I'm just new on the U-Boot list, so I'm not sure what the usual round-trip is. ;-)
Quoted 2 lines
Anyways I've this on my todo and hopefully will get around to it soonish.
Thanks! You'll get a beer next time we meet for ELC-E.
(What? Bribery does not help? Ohh.. ;-) )
Regards,
Yann E. MORIN.
Signature · 6 lines
.-----------------.--------------------.------------------.--------------------. | Yann E. MORIN | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: | | +33 662 376 056 | Software Designer | \ / CAMPAIGN | ___ | | +33 223 225 172 `------------.-------: X AGAINST | \e/ There is no | | http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL | v conspiracy. | '------------------------------^-------^------------------^--------------------'
PATCH 1/1 arm: sunxi: do not force USB for arch-sunxi
In reply to Yann E. MORINHi,
Quoted 18 lines · Yann E. MORIN
Currently, USB is forced-enabled for the sunxi familly, and there is no way to disable it.
However, USB takes a long time to initiliase, delaying the boot by up to 5 seconds (without any USB device attached!). This is a very long delay, especially in cases where USB booting is not wanted at all, and where the device is expected to boot relatively often (even in production).
Change the way the dependencies are handled, by only forcibly selecting USB when
CONFIG_DISTRO_DEFAULTS("defaults suitable for booting general purpose Linux distributions") is set. This option defaults to y for the sunxi familly, so the current default behaviour is kept unchanged. Users interested in boot time and/or size will be able to disable this to further disable USB.With USB disabled, the time spent in U-Boot before handing control to the Linux kernel is about 1s now, down from ~5s (Nanopi Neo, sunxi H3).
Quoted 7 lines
Signed-off-by "Yann E. MORIN" <[email protected]>Cc Ian Campbell <[email protected]>Cc Hans De Goede <[email protected]>---
This is a tentative patch, acting as an RFC (unless it is good to go as is, of course!).
I cannot come up with a better approach either, so this LGTM:
Regards,
Hans
Quoted 50 lines
This has been discussed on IRC with <ssvb> and <apritzel>, and this solution is what emerged from the discussions as a first step.
The second step would be to defer intialisation of drivers until they are actually needed, i.e. if main boot is not from USB, then don't initiliase USB; if main boot fails, then initialise addtional drivers, like USB... Or something along those lines... That's a much tougher work for me, though...
There are other features that are currently forced like USB, but USB is by far the worst "offender" and a low-hanging fruit. Those other "offenders" can be handled in follow up changes.
--- arch/arm/Kconfig | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)arch/arm/Kconfig +5
-5@@ -561,22 +561,22 @@ config ARCH_SUNXI bool "Support sunxi (Allwinner) SoCs" select CMD_GPIO select CMD_MMC if MMC - select CMD_USB + select CMD_USB if DISTRO_DEFAULTS select DM select DM_ETH select DM_GPIO select DM_KEYBOARD select DM_SERIAL - select DM_USB + select DM_USB if DISTRO_DEFAULTS select OF_BOARD_SETUP select OF_CONTROL select OF_SEPARATE select SPL_STACK_R if SUPPORT_SPL select SPL_SYS_MALLOC_SIMPLE if SUPPORT_SPL select SYS_NS16550 - select USB - select USB_STORAGE - select USB_KEYBOARD + select USB if DISTRO_DEFAULTS + select USB_STORAGE if DISTRO_DEFAULTS + select USB_KEYBOARD if DISTRO_DEFAULTS select USE_TINY_PRINTF config TARGET_TS4800