Hi All,
I'm sorry to tell you that I failed to boot linux kernel with the mainline u-boot on rk3288 board(both evb-rk3288 & fennec-rk3288). It was stuck in cleanup_before_linux() before jumping to linux, and the boot_stage_flag is BOOTSTAGE_ID_BOOTM_HANDOFF.
## Current stack ends at 0x7df638b0 * kernel: cmdline image address = 0x02000000 ## No init Ramdisk ramdisk start = 0x00000000, ramdisk end = 0x00000000 ## No Flattened Device Tree Continuing to boot without FDT Initial value for argc=3 Final value for argc=3 using: ATAGS ## Transferring control to Linux (at address 02000000)...
Starting kernel ...
With the further investigation, it never returnned back from invalidate_dcache_all(). I mean that I can't reach stage 4 as below.
cleanup_before_linux ==>cleanup_before_linux_select ==>1.disable_interrupts ==>2.dcache_disable ==>3.invalidate_dcache_all ==>4.icache_disable
Debug further, invalidate_dcache_all invalidate all cache one-by-one which cache type is DATA_ONLY, INSTRUCTION_DATA or UNIFIED. And invalidate way from one set to another set in order. The problem is that the PC ran away in invalidate way loop [cache level L1!!!].
I add some serial output code in __v7_flush_dcache_all to figure out the bog. I expect: Print the value of r9 in sequence, e.g 0x7f, 0x7e, 0x7d..... 0x01, 0x00 (hex) In fact, print the value of r9 in sequence at first, but print unexpected value afterwards. e.g 0x7f, 0x7e, 0x7d, ..,0x73, 0x40, 0x85,....
ENTRY(__v7_flush_dcache_all) [snip] loop1: mov r9, r7 @ create working copy of max index loop2: + stmfd sp!, {r0} + ldr r0, =0xff690000 + str r9, [r0] + ldmfd sp!, {r0} ARM( orr r11, r10, r4, lsl r5 ) @ factor way and cache number into r11 THUMB( lsl r6, r4, r5 ) THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11 ARM( orr r11, r11, r9, lsl r2 ) @ factor index number into r11 THUMB( lsl r6, r9, r2 ) THUMB( orr r11, r11, r6 ) @ factor index number into r11 mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way subs r9, r9, #1 @ decrement the index bge loop2 subs r4, r4, #1 @ decrement the way bge loop1 skip: ENDPROC(__v7_flush_dcache_all)
I don't have the jtag, hence I can't address the current pc. I have no doubt that if any glitches in __v7_flush_dcache_all, I reviewed several times, also copy kernel's implement to here. :-( No effect. A more interesting thing is that Sandy had report it. He and I have similar problem. Everything work fine after I applied his patches, or disable dcache(active CONFIG_SYS_DCACHE_OFF). @Stany, I'm sorry that I disable dcache during hack.. That was a mistake:-(
@Simon & hieko, Can you boot linux with the mainline u-boot? have a try?