lauhub Posted June 17, 2016 Posted June 17, 2016 Hi, I generated SD images for A20-OLinuXino-Lime2-eMMC boards. Kernel is 4.6.2, Debian wheezy, u-boot 2016.05 On my last two images (generated with slight differences in u-boot configuration), the first time I booted, everything worked fine. After that, I installed a booting system on the eMMC of the card. After few boots, (on the same board) the first SD card hanged (several minutes) just after displaying: random: nonblocking pool is initialized The other card continued to work (booting did not hang). A few hours later, I copied several files into a /data directory (.deb files). Trying to boot that second card, it ran in the same blocked status: "random: nonblocking pool is initialized". The first card: same thing. I already waited for an hour once without success. Booting from eMMC does does not hang Any clue on what could avoid this problem ? And what causes it ?
wildcat_paris Posted June 17, 2016 Posted June 17, 2016 a little guess here the following step (after random init) blocks it maybe hardware or in the example the swap setup http://askubuntu.com/questions/672121/is-it-usual-ubuntu-14-04-2-to-take-a-long-time-at-random-nonblocking-pool-is-i Maybe your SD card has a problem.
lauhub Posted July 4, 2016 Author Posted July 4, 2016 Thank you, I think I found why it did not work: without Ethernet cable connected, the boot process hangs. With the Ethernet cable connected, it works. So I think that the random pool was not enough random without the cable connection. So good news: my SD card is fine ! 1
wildcat_paris Posted July 4, 2016 Posted July 4, 2016 Thank you, I think I found why it did not work: without Ethernet cable connected, the boot process hangs. With the Ethernet cable connected, it works. So I think that the random pool was not enough random without the cable connection. So good news: my SD card is fine ! Good job and thanks as you give a clue to another thread.
lauhub Posted July 8, 2016 Author Posted July 8, 2016 I still have the same problem on some SD cards (even with network connected). Here is another lead I have not time yet to follow: http://blog.jamesrhall.com/2014/04/ubuntu-server-1404-fun.html Apparently, the kernel switches to a video mode that is not seen through serial link. So adding nomodeset could avoid this blocking. Good job and thanks as you give a clue to another thread. I am interested in the link of the other thread you talked about 1
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