On Jan 13, 2009, at 7:08 PM, Liu Dave wrote:
>> +#ifndef CONFIG_SYS_DDR_TLB_START
>> +#define CONFIG_SYS_DDR_TLB_START 8
>> +#endif
>> +
>> unsigned int setup_ddr_tlbs(unsigned int memsize_in_meg)
>> {
>> unsigned int tlb_size;
>> @@ -137,7 +141,7 @@ unsigned int setup_ddr_tlbs(unsigned int
>> memsize_in_meg)
>> * Configure DDR TLB1 entries.
>> * Starting at TLB1 8, use no more than 8 TLB1 entries.
>> */
>> - ram_tlb_index = 8;
>> + ram_tlb_index = CONFIG_SYS_DDR_TLB_START;
>> ram_tlb_address = (unsigned int)CONFIG_SYS_DDR_SDRAM_BASE;
>> while (ram_tlb_address < (memsize_in_meg * 1024 * 1024)
>> && ram_tlb_index < 16) {
>
> Kumar,
>
> is it possible to change TLB alloc way?
> current u-boot TLB is easy to conflict/confus to users.
> there are two limitations
> 1) the magic number 8 for DDR
> 2) the TLB14/TLB15 never can be used to board code.
>
> These are TLBs that board code can use just like
> 0,1....7,skip DDR(8....), skip 14 and 15.
>
> Basically it is limited to 0-7.
I'm not sure what you are asking about. I agree we have some
limitations but for the vast majority of boards 8 entries has been
enough.
I'm all for any patches that try and make the allocation a bit more
dynamic. We can do something similar to the LAW code if someone wants
to work up patches.
- k
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