Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH v4] ARM: configs: Add Freescale LS1021A defconfig | Date | Wed, 14 Oct 2015 14:54:48 +0200 |
| |
On Wednesday 14 October 2015 10:18:47 Huan Wang wrote: > > On Thursday 24 September 2015 07:27:10 Huan Wang wrote: > > > > On Fri, Sep 18, 2015 at 4:38 AM, Huan Wang > > > > <alison.wang@freescale.com> > > > > wrote: > > > > > > > > > [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. > > > > > > > > > > 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 ... ". > > > > > > 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.
My first guess is that there is something wrong with your debug_ll implementation, as that would explain why you can't get anything to the console after turning on page tables.
It looks like ls1021a uses lpuart, but I can't even see an implementation for that in arch/arm/include/debug/. What code do you use for printing?
Arnd
| |