short white screen after kernel boots
andy at openmoko.com
Fri Oct 31 15:28:41 CET 2008
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Somebody in the thread at some point said:
| Hi list,
| There is a short period of white screen after kernel boots. It is due
| to that the glamo driver is initializing and the backlight is already
| turned on by u-boot:
| [ 0.865000] glamo3362 glamo3362.0: Detected Glamo core 3650
Revision 0002 (49
| -> screen turns white in glamo_init_script
| [ 0.905000] glamo3362 glamo3362.0: Glamo core now 49119232Hz CPU /
| [ 0.905000] Detected S-Media IRQ# pullup, enabling interrupt
| [ 1.005000] glamo-spi-gpio glamo-spi-gpio.0: registering c039bb50:
| [ 1.035000] SMEDIA Glamo frame buffer driver (C) 2007 Openmoko, Inc.
| -> screen turns black after glamofb_set_par
| [ 1.640000] Console: switching to colour frame buffer device 80x58
| My idea is to avoid re-initialization if uboot has already done it. Is
| it sound ok?
| BTW, the glamofb initializes the 4MB memory allocated to it during
| initialization. It takes about 0.5 seconds. The attached patch cuts it
| down to 0.1 seconds by only initializing the part used for framebuffer.
The patch sounds good, thanks.
But the problems with white screen on boot are going to be solved a
better way: Qi does not turn on the backlight and when the
balaji-tracking stuff is used the backlight device is a child of the
framebuffer, meaning the backlight will not be initialized until the
framebuffer has been initialized.
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