Wolfgang Denk wd@denx.de wrote：
Jonas Dietsche maillist@fsforth.de wrote:
Using an u-boot with the NS16550 makes linux not booting any more. The last message I get is "Starting kernel ...". It is
It seems that NS16550 driver in kernel wasn't enabled or work right.
The Linux drivers must not make any assumptions about any initialization done or not done by any boot loader. Fix your Linux driver.
But one exception for serial console driver. I found there wasn't enable control of UART receiver in 8xx kerenl serial console driver uart.c. Maybe this driver make a assumption that boot loader does this job? At least I ported the driver work right on my 8xx custom board without any change in it:-)
Also, sometimes we could initialize some status in U-Boot for ready and then change it in kerenl to finish some special work. I once made the LCD backlight in boot process of my target like PC did to aviod seeing the LCD screen flickering. First enable and then shut down in u-boot, open it later in LCD kernel driver:-)
IMHO, if one person did u-boot and kernel port both, he would have the chance to consider the harmony between U-Boot and Kernel. So some initialization like receiver enable in kernel driver could be omitted. Is this an informal idea?
Thanks for your nice time,
===== Best regards,
Sam
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