[PATCH v1 4/9] stm32mp: dram_init: Limit DDR usage under 4GB boundary for STM32MP

[Patrice CHOTARD]

On 11/9/23 10:13, Patrick DELAUNAY wrote:
> Hi,
> 
> On 10/27/23 16:42, Patrice Chotard wrote:
>> Limit DDR usage under 4GB boundary on STM32MP regardless of
>> memory size declared in device tree.
>>
>> Signed-off-by: Patrice Chotard <patrice.chotard at foss.st.com>
>> ---
>>
>>   arch/arm/mach-stm32mp/dram_init.c | 8 +++++++-
>>   1 file changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/mach-stm32mp/dram_init.c b/arch/arm/mach-stm32mp/dram_init.c
>> index cb35ed60ca1..fb1208fc5d5 100644
>> --- a/arch/arm/mach-stm32mp/dram_init.c
>> +++ b/arch/arm/mach-stm32mp/dram_init.c
>> @@ -52,9 +52,15 @@ phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
>>       if (!total_size)
>>           return gd->ram_top;
>>   +    /*
>> +     * make sure U-Boot uses address space below 4GB boundaries even
>> +     * if the effective available memory is bigger
>> +     */
>> +    gd->ram_top = clamp_val(gd->ram_top, 0, SZ_4G - 1);
>> +
>>       /* found enough not-reserved memory to relocated U-Boot */
>>       lmb_init(&lmb);
>> -    lmb_add(&lmb, gd->ram_base, get_effective_memsize());
>> +    lmb_add(&lmb, gd->ram_base, gd->ram_top - gd->ram_base);
>>       boot_fdt_add_mem_rsv_regions(&lmb, (void *)gd->fdt_blob);
>>       /* add 8M for reserved memory for display, fdt, gd,... */
>>       size = ALIGN(SZ_8M + CONFIG_SYS_MALLOC_LEN + total_size, MMU_SECTION_SIZE),
> 
> 
> Reviewed-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
> 
> Thanks
> Patrick
> 
Applied to u-boot-stm32/next

Thanks
Patrice