Hi, I'm trying to boot Android in the Normal World of an i.MX53 QSB using U-boot in the Secure World as the bootloader.
I've adapted U-boot in order to switch to Normal World upon a SMC call. The Android version I'm using is Adeneo BSP for Android Gingerbread v4.3.
Android boots fine when I disable the world switch in U-boot, but when I try to boot it in the Normal World it freezes in a Kernel Panic before running the Init.
I followed the patch made by Stefan Kalkowski (as suggested in https://community.freescale.com/thread/308152 ) because I was experiencing a similar problem (FAILED TO RELEASE IRAM PARTITION). Unlike Miao Yu in that post my execution didn't stop there. I thought this would be enough to run Android in the Secure World (because this is what Stefan did) but apparently it didn't work. The problem remains the same.
What happens is the kernel boots successfully and then the following flow occurs: (1) init_post() at kernel/init/main.c:826 (2) run_init_process() at kernel/init/main.c:817 (3) kernel_execve() at kernel/arch/arm/kernel/sys_arm.c:81 Inside kernel_execve() when we return to user space by manipulating the kernel stack (asm code below) it lauches a Kernel Panic and init is never executed.
ASM CODE: asm( ... "b ret_to_user" : : "r" (current_thread_info()), "Ir" (THREAD_START_SP - sizeof(regs)), "r" (®s), "Ir" (sizeof(regs)) : "r0", "r1", "r2", "r3", "ip", "lr", "memory");
In addition we noticed that the execution jumps to do_undefinstr at kernel/arch/arm/kernel/entry-armv.S:689 b do_undefinstr
Besides this we confirmed that init is never executed by adding a print to init's main function (src/system/core/init/init.c:713).
Thanks, Tiago Brito
Hi Tiago,
On 05/09/2016 11:40 AM, Tiago Brito wrote:
Hi, I'm trying to boot Android in the Normal World of an i.MX53 QSB using U-boot in the Secure World as the bootloader.
I've adapted U-boot in order to switch to Normal World upon a SMC call. The Android version I'm using is Adeneo BSP for Android Gingerbread v4.3.
Android boots fine when I disable the world switch in U-boot, but when I try to boot it in the Normal World it freezes in a Kernel Panic before running the Init.
I followed the patch made by Stefan Kalkowski (as suggested in https://community.freescale.com/thread/308152 ) because I was experiencing a similar problem (FAILED TO RELEASE IRAM PARTITION). Unlike Miao Yu in that post my execution didn't stop there. I thought this would be enough to run Android in the Secure World (because this is what Stefan did) but apparently it didn't work. The problem remains the same.
What happens is the kernel boots successfully and then the following flow occurs: (1) init_post() at kernel/init/main.c:826 (2) run_init_process() at kernel/init/main.c:817 (3) kernel_execve() at kernel/arch/arm/kernel/sys_arm.c:81 Inside kernel_execve() when we return to user space by manipulating the kernel stack (asm code below) it lauches a Kernel Panic and init is never executed.
ASM CODE: asm( ... "b ret_to_user" : : "r" (current_thread_info()), "Ir" (THREAD_START_SP - sizeof(regs)), "r" (®s), "Ir" (sizeof(regs)) : "r0", "r1", "r2", "r3", "ip", "lr", "memory");
In addition we noticed that the execution jumps to do_undefinstr at kernel/arch/arm/kernel/entry-armv.S:689 b do_undefinstr
Besides this we confirmed that init is never executed by adding a print to init's main function (src/system/core/init/init.c:713).
I do not see any relation to the Genode OS framework following your setup. Would you be so kind to respect the topic of this mailing list?
Just a short remark: not seeing any "printf" results from init does not mean that no init code is executed at all, it could be one the instructions in the call-trace of "printf", which caused the undefined instruction. If you notice that the undefined instruction handler of Linux is called, maybe you can get the values of SPSR_UND (saved program status register of undefined mode) and LR_UND (link register of undefined mode). Those values hint you what instruction (LR == former instrcution pointer; SPSR gives you former execution mode) caused the exception exactly.
Regards Stefan
Thanks, Tiago Brito
Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z
genode-main mailing list genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
-
Stefan Kalkowski -
Tiago Brito