Tony Lindgren <tony@xxxxxxxxxxx> writes: > * Ben Gamari <bgamari.foss@xxxxxxxxx> [131119 19:07]: >> Chao Xu <caesarxuchao@xxxxxxxxx> writes: >> >> > Hi, >> > >> > I also try to boot v3.12 on my pandaboard rev A2, but it hangs at >> > "starting kernel". My SD card is originally loaded with a linaro 12.04 >> > ubuntu-developer image. I have tried with v3.7 and v3.8 uImage and >> > both of them work normally, but v3.12 hangs. Is there any trick I >> > missed? Do I need to use the new u-boot as used by Ben? >> > >> I've written up some of my experiences bringing up 3.12 on the >> PandaBoard here[1]. You may find it helpful. Regardless, I would >> definitely try upgrading u-boot. > > Nice investigative blogging :) > Thanks! > Care to also update it with the other issues remaining on pandaboard? > Sure. > Sounds like we're pretty close to having things working nicely with > mainline kernel on it, so let's just fix those issues ASAP. > > I'm aware of at least two issues: > > 1. The WLAN not working after a soft reset, or if the interface is > reset with ifconfig down. This could be a typo somewhere in the > .dts file for the WLAN regulator or something like that. > Yes, although frankly I've more or less given up on the wl12xx. This is really a matter for linux-wireless@ but for some reason I find that it is terribly unreliable. It stay associated without a problem but for some reason I encounter extremely long (>2 seconds) dropouts where no traffic can get in or out. Nothing is logged so I really have no idea how to go about debugging this. Ultimately Ethernet is fine for my purposes anyways. > 2. Suspend and resume does not wake-up from serial console and spews > a bunch of warnings. The wake-up issue can be fixed with the new > the new interrupts-extended property to use the wake IRQs, I'll > try to update my patches for that today. > Thankfully this is for a build-bot so this should be a problem for me. I'll mention these in the write-up. >> > And here is a separate problem with building u-boot. I cloned the >> > upstream u-boot repository. The latest commit is >> > c2e5e802ecb7ab668ce9911b210ed68c804b349f. Then I did: >> > make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- omap4_panda_config >> > make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- -j8 >> > cp MLO u-boot.img /media/boot/ >> > But when turn on my pandaboard, there is NO output from the serial >> > console. I didn't change the other file in the boot partition. They >> > are from linaro 12.04 ubuntu-developer image. >> > >> I would check that you have earlyprintk enabled (both in the kernel >> configuration as well as on the kernel command line). Moreover, ensure >> that the correct serial devices is selected for low-level debug output >> (in the kernel configuration). > > I wonder if we also have some dependency to some earlier versions of > u-boot as u-boot now only muxes the essential pins? > I haven't been very careful in characterizing the behavior of various u-boot versions (although I've tried several) so I'm afraid I can't say. Thanks again for your help. Cheers, - Ben
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