[U-Boot] [PATCH] arm64: Keep macro PGTABLE_SIZE for non-full-va map

[york sun]

On 03/21/2016 12:12 PM, Alexander Graf wrote:
> 
> On Mar 21, 2016, at 7:59 PM, York Sun <york.sun at nxp.com> wrote:
> 
>> Commit 7985cdf removed non-full-va map code, replaced PGTABLE_SIZE
>> with get_page_table_size() function for all. It is incorrect for
>> platforms with non-full-va mapping, at this moment Layerscape SoCs.
>>
>> Signed-off-by: York Sun <york.sun at nxp.com>
>> CC: Alexander Graf <agraf at suse.de>
>> CC: Alison Wang <alison.wang at nxp.com>
>> CC: Prabhakar Kushwaha <prabhakar.kushwaha at nxp.com>
>> ---
>> arch/arm/include/asm/system.h |    4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
>> index ac1173d..fab6f0c 100644
>> --- a/arch/arm/include/asm/system.h
>> +++ b/arch/arm/include/asm/system.h
>> @@ -20,7 +20,11 @@
>> #ifndef __ASSEMBLY__
>>
>> u64 get_page_table_size(void);
>> +#ifdef CONFIG_SYS_FULL_VA
> 
> This macro doesn't exist anymore. We need to do something different. Let me cook up a patch.
> 

Thanks.

After this, I want to discuss the possibility to use the new infrastructure for
our SoCs. The key is we have limited on-chip RAM before DDR is initialized. We
cannot use full va mapping for this reason for early MMU tables. We should have
not problem to use it for the final MMU tables. We are exploring initializing
DDR before U-Boot, but we are not anywhere close yet.

York