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In macints.c there is some startup code which disables the SONIC interrupt in an attempt to avoid an unhandled slot interrupt, which would be fatal. This only works on those machines where the SONIC device is on-board. When the mac_sonic driver is built-in, there's little point in doing this, because the device will be initialized a few seconds later anyway. But when mac_sonic is a module, the window for an unhandled interrupt is longer. Either way, we've already run the gauntlet for 5 or 10 seconds by the time we get around to disabling this particular device. It's only by sheer luck that we got this far. Really, this is too little too late. The general problem of unhandled early interrupts also affects other devices on other models. There are better ways to resolve this problem. 1) When using the Penguin bootloader, boot Mac OS with extensions disabled (by holding down the shift key at startup or by use of the Extensions Manager control panel). The Penguin docs already contain this advice, as it is always effective. 2) Have the Penguin bootloader disable the device. It already attempts to disable slot interrupts. But since some hardware cannot mask slot interrupts, Penguin should probably close the relevant device drivers. 3) Use Emile instead of Penguin. AFAIK the boot ROM never enables network device interrupts and hence they don't need to be disabled. Remove this hack. It requires maintenance and it doesn't solve the problem. It improves the odds for a few models, but so does setting CONFIG_MAC_SONIC=y. Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.