don.bai...@gmail.com: > So to get this back on the track of RPI emulated in QEMU … has anyone > successfully used the Miller image with Q?
After a bit of experimentation, I have done so, for some value of "successfully". A few tweaks are required first, because QEMU's emulation of Pi hardware and firmware is not as faithful as it might be: - binary kernel file is loaded at 0x10000, not 0x8000 - the watchdog timer doesn't work (or isn't there) - system timer behaviour is a bit peculiar - emulation of the SDMMC in multi-block mode is spectacularly slow (transfers take not milliseconds but seconds) After tweaking as shown below, a QEMU-compatible kernel can be built with mk CONF'='pi2 9pi2.qemu and run with something like qemu-system-arm -M raspi2b -kernel 9pi2.qemu -serial stdio \ -drive file=9pi.img,if=sd,format=raw \ -append 'readparts=1 console=1 *ncpu=1 nobootprompt=local!/dev/sdM0/fossil' For convenience I've put a kernel file on /n/sources/contrib/miller/9pi2.qemu However ... - the DWC usb host adapter of the Pi2/3 does not work the way Plan 9 expects - therefore there's no functioning usb - therefore I don't know how to attach a keyboard, mouse or network interface If anybody wants to debug this further I'm happy to collaborate, but I'm not sufficiently motivated to do it myself. Diffs against files in /n/sources/contrib/miller/9/bcm, which I think are identical to 9legacy 9/bcm sources): mkfile: 85a86,90 > $p$CONF.qemu:DQ: $CONF.$O $OBJ $LIB > $CC $CFLAGS '-DKERNDATE='`{date -n} $CONF.c > echo '# linking kernel for QEMU' > $LD -s -l -o $target -H6 -R4096 -T0x80010000 $OBJ $CONF.$O $LIB > mem.h: 48c48 < #define KTZERO (KZERO+0x8000) /* kernel text start */ --- > #define KTZERO (KZERO+0x10000) /* kernel text start */ archbcm2.c: 225c225 < addclock0link(wdogfeed, HZ); --- > //addclock0link(wdogfeed, 1000); sdmmc.c: 25c25 < Multiblock = 1, --- > Multiblock = 0, clock.c: 35c35 < MinPeriod = 10, --- > MinPeriod = 100, 124c124 < u32int t0, t1, tstart, tend; --- > u32int t0, t1, tstart; 142d141 < tend = tstart + 10000; 145c144 < }while(tn->clo != tend); --- > }while(tn->clo - tstart < 10000); ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T5da5467097e4eab2-M2edf6c6413ee49aaee761281 Delivery options: https://9fans.topicbox.com/groups/9fans/subscription