[yocto] Unable to get serial console login prompt - PowerPC 440 Virtex 5 processor

[Khem Raj]

On Aug 3, 2012, at 3:05 PM, Elvis Dowson <elvis.dowson at gmail.com> wrote:

> Hi,
> 
> On Aug 4, 2012, at 1:30 AM, Elvis Dowson wrote:
> 
>> I'll try to switch back to a non-static bash, and try booting the core-image-minimal filesystem once again.
> 
> Switching back to the core-image-default non-static bash version, didn't work. I get no bash prompt, even through I specified init=/bin/sh for the kernel bootargs
> 
> zImage starting: loaded at 0x00800000 (sp: 0x00dacfb0)
> Allocating 0x540e0c bytes for kernel ...
> gunzipping (0x00000000 <- 0x0080f000:0x00a17ddd)...done 0x4235c0 bytes
> Attached initrd image at 0x00a18000-0x00dab775
> initrd head: 0x1f8b0808
> 
> Linux/PowerPC load: console=ttyS0,9600n8 ip=off root=/dev/ram rw rootwait init=/bin/sh
> Finalizing device tree... flat tree at 0xdb90e0
>  PM: Adding info for No Bus:ttyv9
> [    0.478914] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
> [    0.484189] 83e00000.serial: ttyS0 at MMIO 0x83e01003 (irq = 20) is a 16550
> [    0.679634] console [ttyS0] enabled
> [    0.743646] brd: module loaded
> [    0.790371] loop: module loaded
> [    0.827695] xsysace 83600000.sysace: Xilinx SystemACE revision 1.0.12
> [    0.904387] xsysace 83600000.sysace: No CF in slot
> [    0.963434] Xilinx SystemACE device driver, major=254
> [    1.024322] xilinx_emaclite 81000000.ethernet: Device Tree Probing
> [    1.097851] xilinx_emaclite 81000000.ethernet: error registering MDIO bus
> [    1.178937] xilinx_emaclite 81000000.ethernet: MAC address is now 00:0a:35:b7:78:00
> [    1.272553] xilinx_emaclite 81000000.ethernet: Xilinx EmacLite at 0x81000000 mapped to 0xD10A0000, irq=17
> [    1.387465] xilinx_ps2 81480000.ps2: Device Tree Probing 'ps2'
> [    1.456732] xilinx_ps2 81480000.ps2: Xilinx PS2 at 0x81480000 mapped to 0xd1036000, irq=22
> [    1.556112] xilinx_ps2 81481000.ps2: Device Tree Probing 'ps2'
> [    1.625786] xilinx_ps2 81481000.ps2: Xilinx PS2 at 0x81481000 mapped to 0xd1038000, irq=23
> [    1.726276] mousedev: PS/2 mouse device common for all mice
> [    1.793618] i2c /dev entries driver
> [    1.835429] Device Tree Probing 'i2c'
> [    1.879626] xilinx-iic #0 at 0x81600000 mapped to 0xD10C0000, irq=18
> [    1.957193] TCP cubic registered
> [    1.995099] NET: Registered protocol family 17
> [    2.790435] atkbd serio0: keyboard reset failed on xilinxps2/serio at 81480000
> [    3.274705] RAMDISK: gzip image found at block 0
> [    3.681850] atkbd serio1: Frame/parity error: 02
> [    3.858630] input: AT Raw Set 2 keyboard as /devices/plb.0/xps-ps2.1/81481000.ps2/serio1/input/input0
> [    4.242871] VFS: Mounted root (ext2 filesystem) on device 1:0.
> [    4.313049] Freeing unused kernel memory: 152k freed
> 
> What should I do now to debug this issue further?
> 
> I have disabled image-prelink by not including it in my local.conf as follows:
> 
> # Remove image-prelink for PowerPC 32-bit and 64-bit targets.
> USER_CLASSES ?= "buildstats image-mklibs"
> 
> Any thoughts on what I can try to do next, to narrow down the issue, with bash working statically, but not when linked with shared libraries?
> 


OK couple of things.  You could boot into static bash thats good, keep it that way and bundle some dynamically linked programs into the root file system
may be just a hello world which is dynamically linked. I would also compile a static version of gdb and strace but that could be next steps.

then boot into this static shell and try to run the dynamically linked hello world. Does that work ?
if not we have a dynamic linking issue. 

Then you can go a step deeper and see whats going on. Many  a times interpreter is specified wrongly in the elf file.
and there could be dynamic linker issues too. But step at a time.


> Best regards,
> 
> Elvis Dowson
> 
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> yocto at yoctoproject.org
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