Re: [PATCH] alpha: add udelay to io port paths

2019-04-04 Thread Maciej W. Rozycki
On Wed, 3 Apr 2019, Mikulas Patocka wrote: > > > > Well, actually `iowriteX' is generic and for MMIO you have `writeX'. > > > > See lib/iomap.c, the comment at the top and e.g. `iowrite8' there for > > > > an > > > > actual proof. Alpha may have an oddball implementation, but there you > >

Re: [PATCH] alpha: add udelay to io port paths

2019-04-04 Thread Linus Torvalds
On Wed, Apr 3, 2019 at 9:28 AM Mikulas Patocka wrote: > > So, I submit this patch that adds 1us delay between any I/O accesses > directed at the ISA bus. This patch makes my machine boot. 1us seems to be > minimal acceptable value, with 800ns I still get hangs. I don't think this is right. The *