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POHow do I find ARM Linux entry point when it fails to uncompress?
 

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  1. POHow do I find ARM Linux entry point when it fails to uncompress?
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    <p>I am trying to boot Linux via U-boot on a custom board with i.MX6 (CPU core is ARM Cortex A9)</p> <p>We seem to have ported Das U-Boot(2009.08) successfully. But booting Linux fails at the last U-Boot message: "Starting kernel ..."</p> <p>Here is my relevant environment:</p> <pre><code>bootargs=console=ttymxc1,115200 vmalloc=400M root=/dev/mmcblk0p1 rootwait consoleblank=0 earlyprintk video=mxcfb0:dev=lcd,LCD-ORTUS,if=RGB24 video=mxcfb1:dev=hdmi,1280x720M@60,if=RGB24 calibration tsdev=tsc2004 fbmem=10M,28M bootcmd=ext2load mmc 0:1 10800000 /boot/uImage ; bootm 10800000 </code></pre> <p>The boot output is</p> <pre><code>Loading file "/boot/uImage" from mmc device 0:1 (xxa1) 4043552 bytes read ## Booting kernel from Legacy Image at 10800000 ... Image Name: Linux-3.0.35 Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 4043488 Bytes = 3.9 MB Load Address: 10008000 Entry Point: 10008000 Verifying Checksum ... OK Loading Kernel Image ... OK OK Starting kernel ... </code></pre> <p>When I objdump the kernel, at address 80008000, I see the entry point at arch/arm/kernel/head.S, and not arch/arm/boot/compressed/head.S</p> <p>What I see is, the kernel does not even decompress. I tried adding some register manipulation code to signal GPIOs in compressed/head.S with no response.</p> <p>My question is, how can I make sure U-Boot is calling the correct entry point?</p> <p>The exact same kernel binary successfully boots on Freescale's reference board, using the same U-Boot commands.</p> <p>EDIT: I added some traces to U-Boot. Just before calling the kernel, the pointer theKernel is 10008000 and not 10800000. Does this mean U-boot is jumping at the wrong location?</p>
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      1. USIgor Skochinsky
 

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