On Thursday 24 September 2015 07:27:10 Huan Wang wrote:

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On Fri, Sep 18, 2015 at 4:38 AM, Huan Wang
[off-list ref]
wrote:

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[Alison Wang] Thanks for your reply. I agreed with you about
creating a new multi_v7_lpae_defconfig. In
multi_v7_lpae_defconfig, I need to add the following CONFIG_XX to
support LS1021A based on

multi_v7_defconfig.

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CONFIG_ARM_LPAE=y
CONFIG_VMSPLIT_2G=y

Is CONFIG_VMSPLIT_2G=y really needed?

[Alison Wang] I tried to remove CONFIG_VMSPLIT_2G and used the default
CONFIG_VMSPLIT_3G, but kernel could not boot up. It hangs at " Starting

kernel ... ".

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Any suggestion? Thanks.

Try enabling DEBUG_LL for your platform to get some debug output, if  you
still don't get any helpful messages, try also inserting

	printascii(__func__);

statements in the early boot process to see how far you get before the hang.

[Alison Wang] I can get to __turn_mmu_on or later, but I could not get the print
message "Booting Linux on physical CPU 0xf00" in smp_setup_processor_id().

I guess something wrong with the initial page tables in __create_page_tables,
as for CONFIG_VMSPLIT_3G, only PAGE_OFFSET is changed from 0x80000000 to 0xC0000000.
BTW, on our platform, TEXT_OFFSET is 0x00008000, PHYS_OFFSET is 0x80000000.

Any suggestion? Thanks.

Best Regards,
Alison Wang