Messages in this thread | | | Date | Wed, 27 Aug 2003 08:22:38 -0700 | From | "Randy.Dunlap" <> | Subject | Re: Help with debugging of a framebuffer driver on a legacyfree system. |
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On Wed, 27 Aug 2003 16:20:35 +0200 "Thomas S. Iversen" <zensonic@zensonic.dk> wrote:
| Hi there | | As part of a project I am trying to write a framebuffer device | driver for a graphic chip. Up until now I have compiled my | code as a module and been doing insmod, rmmod and that have worked | nicely. | | I then tried to compile the driver into the kernel but that | makes the kernel hang. As my development system are a legacy | free laptop and my driver initializes the screen, the kernel | hangs without me being able to figure out where and why that | happend.
First choice would be to develop on a system where you can add (PCI?) bus probes or other adapters/gadgets, like a port-80 card.
| So I seek advice on how to debug the driver! As said, the | laptop are legacy free, so I have not got a serial port. | I have tried a usb->serial adapter, but that requires a driver. | Can I do USB->USB on another computer? Or? | | Or am I stuck with coding my own printk variant and writing to the | screen or is there any other option I have not thought of?
There are already early_printk patches and an x86-specific "poke a character into video RAM" patch. The latter one is at: http://kernelnewbies.org/documents/videochar.txt
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