On virt_to_phys doubts.

mind entropy mindentropy at gmail.com
Mon Sep 29 13:08:16 EDT 2014


Thanks. It set a byte in RAM and checked it using md.b in u-boot.

-Gautam.

On Sat, Sep 13, 2014 at 10:20 PM, Miles MH Chen <orca.chen at gmail.com> wrote:
> ok, now we can say the virt_to_phys returns a correct physical address.
> 0x32d01fe0. It is a physical address, not a simple offset in dram. Your 64Mb
> dram has physical address within 0x30000000 ~ 0x34000000.
>
> MH
>
> 2014/9/13 下午9:52 於 "mind entropy" <mindentropy at gmail.com> 寫道:
>
>> On Sat, Sep 13, 2014 at 7:13 PM, Miles MH Chen <orca.chen at gmail.com>
>> wrote:
>> > Kernel physical addr : 0x32d01fe0
>> > Platform phys offset : 0x30000000
>> > Page offset : 0xc0553fb4
>> >
>> > The page offset looks weird, since 32bit kernel has 2/2 or 3/1 or 1/3
>> > user/kernel virtual address  split. It is not reasonable to have
>> > 0xc0553fb4
>> > as page offset. You should c0000000 for 3/1 split.
>> >
>>
>> My fault. I had done "0x%llx" in printk. Now I just did a %x and it
>> shows as 0xc0000000.
>>
>> -Gautam.



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