Just to check: have you added "earlyprintk" to your bootargs? - Hemant
________________________________ From: kunal singh [mailto:[email protected]] Sent: Thursday, September 30, 2010 7:40 PM To: Raffaele Recalcati; Nori, Sekhar; Pedanekar, Hemant Cc: [email protected] Subject: Re: problem with serial console Hi All, Thanks a lot for posting the comments here. (1) I have added some printascii() statements in function init/main.c/start_kernel() to trace the boot sequence (a) printascii() to print the command line arguments (b) printascii() before doing the console_init() (c) printascii() after doing the console_init() (2) The log (posted below) suggests that the boot sequence goes beyond console_init(). Since console_init is done I would expect that all my printk messages should start to appear on the console . But it does not. (however the printascii still works, as you can see messages in the bootlog, hence I would assume that hardware is fine) I would appreciate if you can give some suggestion on how to debug this issue further. Thanks, kunal /************* HERE IS THE BOOT LOG ****************************/ run devboot TFTP from server 10.0.0.1; our IP address is 10.0.0.3 Filename '/home/kunal/xcaster/ingenient-bsp/images/uImage'. Load address: 0x82000000 Loading: #T ################################################################ ################################################################# #################T ################################################ ################################################################## ###################T ##########T #################################### ##########################################T #### done Bytes transferred = 1898780 (1cf91c hex) ## Booting image at 82000000 ... Image Name: Linux-2.6.32-rc2-davinci1 Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 1898716 Bytes = 1.8 MB Load Address: 80008000 Entry Point: 80008000 Verifying Checksum ... OK OK Starting kernel ... Uncompressing Linux........................................................................................................................... done, booting the kernel. console=ttyS0,115200n8 root=/dev/nfs rw nfsroot=10.0.0.1:/home/kunal/xcaster/ingenient-bsp/rootfs/fs,udp,v3,rsize=4096,wsize=1400 ip=10.0.0.3:10.0.0.1:10.0.0.1:255.255.255.0:XCASTER5000::off mem=128M mtdparts=davinci-nand.0:96k(ubl),736k(uboot),64k(uboot-env),2m(kernel),61568k(app) eth=80:4C:EF:54:87:0A doing console init now finished console init /***************************************************************/ On Thu, Sep 30, 2010 at 6:26 PM, Raffaele Recalcati <[email protected]<mailto:[email protected]>> wrote: On Thu, Sep 30, 2010 at 2:35 PM, kunal singh <[email protected]<mailto:[email protected]>> wrote: > Hi Raffaele, > > Thanks for the suggestion. > > (1) Console is fine. I am able to communicate with the u-boot (115200,n8). > Also if I use printascii (a kernel function) I am able to output on console. > (2) There is no message, after the kernel decompression (because console is > not up). Here is what I see. > > Load address: 0x82000000 > Loading: ####T ###################T > ########################################## > ################################################################## > ######################T > ############################################ > ################################################################# > ###################T > ##############################################T ## > ######T ######################################## > done > Bytes transferred = 1898828 (1cf94c hex) > ## Booting image at 82000000 ... > Image Name: Linux-2.6.32-rc2-davinci1 > Image Type: ARM Linux Kernel Image (uncompressed) > Data Size: 1898764 Bytes = 1.8 MB > Load Address: 80008000 > Entry Point: 80008000 > Verifying Checksum ... OK > OK > > Starting kernel ... > > Uncompressing > Linux........................................................................................................................... > done, booting the kernel. > > /* AND THEN NOTHING BECAUSE CONSOLE IS NOT FUNCTIONAL, but booting goes on > */ How can you say that boot goes on? Can you check mem inside bootargs? For instance I have 128MB RAM and I use these bootargs. set bootargs 'console=ttyS0,115200n8 rw ip=10.39.10.183:10.39.10.169:10.39.8.1:255.255.248.0:::off root=/dev/nfs nfsroot=10.39.10.169:/home/NFS/ARAGO_DEMO_IMAGE-raf/ mem=128M video=davincifb:output=lcd:format=rgb:vid0=240x...@0,0:vid1=240x...@0,0:osd0=240x...@0,0:osd1=240x...@0,0 ' Don't copy my bootargs, only do some tests. I saw your behaviour when mem was wrong.
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