Re: kern/38758: LOCKDEBUG kernel hangs in esp(4) driver

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

>  sun3 uses real DMA, doesn't it? Different code paths, probably. The 
>  mac68k MD code doesn't use simple_lock() anywhere, though.

I think the problem is esp interrupts are implicitly enabled
by spl2() in esp_quick_dma_go().

I have no idea if there is a safe way to enable serial
interrupts without enabling esp interrupts.
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Izumi Tsutsui