I am porting linux-2.6.23-android-m5-rc14 kernel to TI Davinci DM355, and encountered a problem, could anyone help me to fix the problem?

My development environment:

Fedora Core 8 GCC 4.1.2 <-- I build the cross compiling tool by myself linux-2.6.23-android-m5-rc14 kernel

My problem is the compiled kernel could not boot on EVM board, I have checked the booting process, the uncompress kernel process is done, the problem is happened at the places in 2 files as following list:

arch/arm/kernel/head.S arch/arm/kernel/head-common.S

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The booting information is:

Starting kernel ...

Uncompressing Linux................................................................................................................... done, booting the kernel.

Then, there is no other information on the screen.

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In file arch/arm/kernel/head.S, function __turn_mmu_on

ENTRY(stext) msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | SVC_MODE @ ensure svc mode @ and irqs disabled mrc p15, 0, r9, c0, c0 @ get processor id bl __lookup_processor_type @ r5=procinfo r9=cpuid movs r10, r5 @ invalid processor (r5=0)? beq __error_p @ yes, error 'p' bl __lookup_machine_type @ r5=machinfo movs r8, r5 @ invalid machine (r5=0)? beq __error_a @ yes, error 'a' bl __vet_atags bl __create_page_tables

/* * The following calls CPU specific code in a position independent * manner. See arch/arm/mm/proc-*.S for details. r10 = base of * xxx_proc_info structure selected by __lookup_machine_type * above. On return, the CPU will be ready for the MMU to be * turned on, and r0 will hold the CPU control register value. */ ldr r13, __switch_data @ address to jump to after @ mmu has been enabled adr lr, __enable_mmu @ return (PIC) address <--- this line has run add pc, r10, #PROCINFO_INITFUNC <--- this line has run

.align 5 .type __turn_mmu_on, %function __turn_mmu_on: mov r0, r0 mcr p15, 0, r0, c1, c0, 0 @ write control reg <--- not sure that
it has run mrc p15, 0, r3, c0, c0, 0 @ read id reg mov r3, r3 mov r3, r3 mov pc, r13

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In file arch/arm/kernel/head-common.S, I am not sure that object __switch_data
and function __mmap_switched have run?

.type __switch_data, %object __switch_data: .long __mmap_switched .long __data_loc @ r4 .long __data_start @ r5 .long __bss_start @ r6 .long _end @ r7 .long processor_id @ r4 .long __machine_arch_type @ r5 .long __atags_pointer @ r6 .long cr_alignment @ r7 .long init_thread_union + THREAD_START_SP @ sp

/* * The following fragment of code is executed with the MMU on in MMU mode, * and uses absolute addresses; this is not position independent. * * r0 = cp#15 control register * r1 = machine ID * r2 = atags pointer * r9 = processor ID */ .type __mmap_switched, %function __mmap_switched: adr r3, __switch_data + 4 ldmia r3!, {r4, r5, r6, r7} cmp r4, r5 @ Copy data segment if needed 1: cmpne r5, r6 ldrne fp, [r4], #4 strne fp, [r5], #4 bne 1b mov fp, #0 @ Clear BSS (and zero fp) 1: cmp r6, r7 strcc fp, [r6],#4 bcc 1b ldmia r3, {r4, r5, r6, r7, sp} str r9, [r4] @ Save processor ID str r1, [r5] @ Save machine type str r2, [r6] @ Save atags pointer bic r4, r0, #CR_A @ Clear 'A' bit stmia r7, {r0, r4} @ Save control register values b start_kernel

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Could anyone recommend me how to fix the problem?

Thanks!