Linux/AM5728: Memory map questions

HI Pavel

Thanks for your reply.

Now I'm still confused about the tiler memory.

As we know the AM5728_evm have 2GB DDR3, the address is start at 0x8000 0000， the end is at 0xFFFF FFFF, the size is 2GB.

The  tiler region start address is 0x60000000. 

So I am confusing about How to map the DDR3 memory to the tiler region。

Because we know the 0x6000 0000 is memory hole which need maped to the DDR3 memory and what is the start of the DDR3 memory.

anther question is 

what's the size of the A15 Linux Kernel CMA region and how to increse the Linux kernel CMA region.

Thanks

regards

HI all:

Anyone can help us about this issue.

Thanks 

regards

xixi said:

As we know the AM5728_evm have 2GB DDR3, the address is start at 0x8000 0000， the end is at 0xFFFF FFFF, the size is 2GB.

The  tiler region start address is 0x60000000. 

So I am confusing about How to map the DDR3 memory to the tiler region。

Because we know the 0x6000 0000 is memory hole which need maped to the DDR3 memory and what is the start of the DDR3 memory.

Please explore the simple_buffer_example code, it might give you some hints.

/sys/kernel/debug/dri/ contains debugfs files for the DRM. It can be used to see the framebuffers allocated, the connectors, information about tiler.

http://processors.wiki.ti.com/index.php/Linux_Core_DSS_User's_Guide

Check also below e2e threads:

xixi said:

anther question is 

what's the size of the A15 Linux Kernel CMA region and how to increse the Linux kernel CMA region.

Refer to the below pointers:

HI Pavel ：

Thanks for your reply!!!

Do you have any document to explain this?

As far as I know :

The 0x80000000 is used for Linux kernel

But why it used by the IPU.

#define IPU_MEM_TEXT            0x0
#define IPU_MEM_DATA            0x80000000
 
#define IPU_MEM_IOBUFS          0x90000000
 
#define IPU_MEM_IPC_DATA        0x9F000000
#define IPU_MEM_IPC_VRING       0x60000000
#define IPU_MEM_RPMSG_VRING0    0x60000000
#define IPU_MEM_RPMSG_VRING1    0x60004000
#define IPU_MEM_VRING_BUFS0     0x60040000
#define IPU_MEM_VRING_BUFS1     0x60080000
 
#define IPU_MEM_IPC_VRING_SIZE  SZ_1M
#define IPU_MEM_IPC_DATA_SIZE   SZ_1M
 
#if defined(VAYU_IPU_1)
#define IPU_MEM_TEXT_SIZE       (SZ_1M)
#elif defined(VAYU_IPU_2)
#define IPU_MEM_TEXT_SIZE       (SZ_1M * 6)
#endif
 
#if defined(VAYU_IPU_1)
#define IPU_MEM_DATA_SIZE       (SZ_1M * 5)
#elif defined(VAYU_IPU_2)
#define IPU_MEM_DATA_SIZE       (SZ_1M * 48)
#endif
 
#define IPU_MEM_IOBUFS_SIZE     (SZ_1M * 90)

Thanks

HI 

As I said earlier

The 0x6000 0000 is memory hole which need maped to the DDR3 memory.

Just now we found the datasheet (spruhz6h.pdf 3315 page)like below:

The Tiler memory from 0x6000 0000 must translated to the SDRAM.

So we want to know which SDRAM is maped and what 's the begin of the SDRAM

Thanks regards

HI ALL:

Anyone can help us about this issue.

We just want to know what the corresponding relationship is between the Tiler memory and the DDR3 memory.

Thanks

regards

HI all：

Anyone else know about how to map the DDR3 memory to the Tiler memory?

Thanks

regards 

HI all:

According to the documents which you give us.

We have changed the tisdk_am57xx-evm-rt_defconfig.

CONFIG_CMA_SIZE_MBYTES=48

So whether the above methods can increase the Linux CMA memory.

Even though you have give us so much documents.

But there is no documents to describe the Tiler Memory mapping.

So we are so confusing how to map the DDR3 memory to the Tiler memory like below?

Thanks 

regards