-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Somebody in the thread at some point said: | On Sat, Nov 01, 2008 at 12:12:08AM +0000, Andy Green wrote: |> What I had in mind is not that userspace should bring up the backlight |> (it will look like a brick then if you booted into a rootfs that didn't |> know it was expected) but that the framebuffer driver will blank the |> video memory and then bring up the backlight just after Glamo driver inits. |> |> What we could do is chvt to 4 say and put a small logo in there during |> glamo framebuffer init, just before backlight comes up? | This is with Qi, right? I am using stable kernel and it takes about | 1.25 seconds before we can show anything fancy on the screen. 300ms of | which are mdelay()'s in gta02_machine_init (powering on WLAN module?). | If we could remove them, it is possible to show a graphical screen | within 1 second. This does not take into account the time we spend in | bootloader, which could be another some seconds.
Yes the patch to remove this is in stable-tracking already, it's because the Atheros SDIO stack / AR6001 driver does not recognize the "card" when we power it that it is still defaulting to having to power it. Atheros stack + WLAN driver does not work as modules either. Werner has a mainline SDIO stack implementation of the AR6001 driver under development that might act better eventually. | This is also sort of what I am thinking about. If we define our normal | power-on action to be, for example, long press the power button for 5 | seconds, we can give the users an impression that it enters graphical | boot within 1 second. Because Qi could do its work, including loading | the kernel to ram, during the press without users noticing. If the | power button is released before 5 seconds, Qi powers down the machine | instead of booting the kernel. I think you have identified the few hundred ms that can be shaved off in kernel already, we have identified before the WLAN delay and the many seconds blown in U-Boot and solved that with Qi, there are still "real" savings to be had in userland I am sure of many tens of seconds that will pay off much better. - -Andy -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iEYEARECAAYFAkkMJ3gACgkQOjLpvpq7dMpjEgCdE27jhTR1EV9A1eTKLhaP9r4u lQ0An01nG2Rb6N4zzS4BXttTTLsq31uS =IZmH -----END PGP SIGNATURE-----
