Hi Christophe, On 7/31/21 9:58 AM, Christophe Leroy wrote: > Stan Johnson <user...@yahoo.com> a écrit : > >> Hello, >> >> The current Debian SID kernel will not boot on a PowerBook 3400c running >> the latest version of Debian SID. If booted using the BootX extension, >> the kernel hangs immediately: >> >> "Welcome to Linux, kernel 5.10.0-8-powerpc" >> >> If booted from Mac OS, the Mac OS screen hangs. >> >> Booting also hangs if the "No video driver" option is selected in BootX, >> "No video driver" causes "video=ofonly" to be passed to the kernel. >> >> This is the current command line that I'm using in BootX: >> root=/dev/sda13 video=chips65550:vmode:14,cmode:16 >> >> Kernel v5.9 works as expected. >> >> The config file I'm using is attached. >> >> Here are the results of a git bisect, marking v5.9 as "good" and the >> most current kernel as "bad": >> >> $ cd linux >> $ git remote update >> $ git bisect reset >> $ git bisect start >> $ git bisect bad >> $ git bisect good v5.9 >> >> Note: "bad" -> hangs at boot; "good" -> boots to login prompt >> >> 1) 5.11.0-rc5-pmac-00034-g684da7628d9 (bad) >> 2) 5.10.0-rc3-pmac-00383-gbb9dd3ce617 (good) >> 3) 5.10.0-pmac-06637-g2911ed9f47b (good) >> Note: I had to disable SMP to build this kernel. >> 4) 5.10.0-pmac-10584-g9805529ec54 (good) >> Note: I had to disable SMP to build this kernel. >> 5) 5.10.0-pmac-12577-g8552d28e140 (bad) >> 6) 5.10.0-pmac-11576-g8a5be36b930 (bad) >> 7) 5.10.0-pmac-11044-gbe695ee29e8 (good) >> Note: I had to disable SMP to build this kernel. >> 8) 5.10.0-rc2-pmac-00288-g59d512e4374 (bad) >> 9) 5.10.0-rc2-pmac-00155-gc3d35ddd1ec (good) >> 10) 5.10.0-rc2-pmac-00221-g7049b288ea8 (good) >> 11) 5.10.0-rc2-pmac-00254-g4b74a35fc7e (bad) >> 12) 5.10.0-rc2-pmac-00237-ged22bb8d39f (good) >> 13) 5.10.0-rc2-pmac-00245-g87b57ea7e10 (good) >> 14) 5.10.0-rc2-pmac-00249-gf10881a46f8 (bad) >> 15) 5.10.0-rc2-pmac-00247-gf8a4b277c3c (good) >> 16) 5.10.0-rc2-pmac-00248-gdb972a3787d (bad) >> >> db972a3787d12b1ce9ba7a31ec376d8a79e04c47 is the first bad commit > > Not sure this is really the root of the problem. > > Can you try again without CONFIG_VMAP_STACK ? > > Thanks > Christophe > ...
With CONFIG_VMAP_STACK=y, 5.11.0-rc5-pmac-00034-g684da7628d9 hangs at boot on the PB 3400c. Without CONFIG_VMAP_STACK, 5.11.0-rc5-pmac-00034-g684da7628d9 boots as expected. I didn't re-build the Debian SID kernel, though I confirmed that the Debian config file for 5.10.0-8-powerpc includes CONFIG_VMAP_STACK=y. It's not clear whether removing CONFIG_VMAP_STACK would be appropriate for other powerpc systems. Please let me know why removing CONFIG_VMAP_STACK fixed the problem on the PB 3400c. Should CONFIG_HAVE_ARCH_VMAP_STACK also be removed? thanks -Stan Johnson
