On Tuesday 06 January 2015 23:35:16 Georges Savoundararadj wrote:
Hi Pali Rohár,
Le 06/01/2015 23:19, Pali Rohár a écrit :
ooo, thanks very much for help!
On non omap HS devices that SMC instruction must not be called. Qemu emulate omap GP device (not HS), so here is must not be called too. I remember that linux kernel crashed when called similar function in qemu.
Are you sure?
Yes
In the working version (before commit 41623c) SMC instruction is used (in the do_omap3_emu_romcode_call) and it works well.
Anyway, calling that smc instruction is needed to prevent HW bug on real n900 device. Qemu does not have that HW bug and also do not implement code for that smc instruction.
So really, we should not call do_omap3_emu_romcode_call() function from board/nokia/rx51/rx51.c when uboot is running in qemu.
@Tom, Nishanth, or anybody from TI: how to check if omap device type is HS in uboot? In linux kernel it is possible by:
if (omap_type() == OMAP2_DEVICE_TYPE_SEC) { ... }
I temporary commented do_omap3_emu_romcode_call asm code and qemu does not crash anymore.
Can somebody look into uboot code how to disable calling any code which is using smc instructions on non HS devices?
It looks like do_omap3_emu_romcode_call() is called for nokia n900 only from board code. So check for HS device can be added here...
Commenting do_omap3_emu_romcode_call() in board/nokia/rx51/rx51.c also fixed problem in qemu.
On Tuesday 06 January 2015 23:03:23 Georges Savoundararadj
wrote:
Hi Pali Rohár,
The "prefetch abort exception" occurs in the function do_omap3_emu_romcode_call (in arch/arm/cpu/armv7/omap3/lowlevel_init.S) when executing the instruction "SMC #1".
I can't figure out what makes the difference between the working and the not-working versions. Maybe we should monitor the Secure Configuration Register but gdb does not allow to watch the coprocessor registers.
I hope it helps.
Regards,
Georges
Le 04/01/2015 23:28, Georges Savoundararadj a écrit :
Hi Pali Rohár,
Le 04/01/2015 23:14, Pali Rohár a écrit :
Hello,
here are commands how to compile u-boot for nokia n900, convert uboot image into n900 nand MTD file and run it under linaro arm version of qemu (upstream version of qemu have not merged n900 support yet):
$ export ARCH=arm $ export CROSS_COMPILE=arm-linux-gnueabi- $ make nokia_rx51_config $ make $ qflasher -x xloader-qemu.bin -s secondary-qemu.bin \
-k u-boot.bin -m rx51 -o u-boot.mtd$ qemu-system-arm -M n900 -mtdblock u-boot.mtd -serial /dev/tty
You need:
- qflasher - Nokia generator of nand MTD image with CAL
data * xloader-qemu.bin - Nokia first stage bootloader (X-Loader) * secondary-qemu.bin - Nokia second stage bootloader (NOLO) * qemu-system-arm - Linaro arm version of qemu
Linaro arm version of qemu can be downloaded e.g. from ubuntu: http://packages.ubuntu.com/source/precise/qemu-linaro (I'm using this version)
Nokia qflasher and bootloaders are proprietary and closed source but could be found on internet. License allows to redistribute binaries for non commercial purposes. If you are unable to find it on internet anymore (originally they were hosted on website repo.meego.com before intel turned it off) and you are OK with that license, I can send you needed files.
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I am OK with that. Please send me the needed files.
Thanks,
Best regards,
Georges