[PATCH 1/3] imx9: scmi: Fix SPL trampoline buffer for 1GB DDR

[Ye Li]

On 6/18/2026 3:00 PM, Francesco Dolcini wrote:
> + Emanuele
> 
> On Thu, Jun 18, 2026 at 09:17:47AM +0800, ye.li at oss.nxp.com wrote:
>> From: Ye Li <ye.li at nxp.com>
>>
>> After supporting get DRAM size from SM, the trampoline buffer address
>> still depends on PHYS_SDRAM_SIZE. If the real DDR size is less than
>> PHYS_SDRAM_SIZE, the trampoline buffer address is invalid and SPL will
>> crash. So use board_phys_sdram_size to get real DDR size to calculate
>> correct address.
>>
>> Fixes: e1cc7117b630 ("imx9: scmi: Get DDR size through SM SCMI API")
>> Signed-off-by: Ye Li <ye.li at nxp.com>
>> ---
>>   arch/arm/mach-imx/imx9/scmi/soc.c | 16 +++++++++++-----
>>   1 file changed, 11 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/arm/mach-imx/imx9/scmi/soc.c b/arch/arm/mach-imx/imx9/scmi/soc.c
>> index 00b8693fbe0..ce86cdf8574 100644
>> --- a/arch/arm/mach-imx/imx9/scmi/soc.c
>> +++ b/arch/arm/mach-imx/imx9/scmi/soc.c
>> @@ -1177,10 +1177,11 @@ enum boot_device get_boot_device(void)
>>   
>>   bool arch_check_dst_in_secure(void *start, ulong size)
>>   {
>> -	ulong ns_end = CFG_SYS_SDRAM_BASE + PHYS_SDRAM_SIZE;
>> -#ifdef PHYS_SDRAM_2_SIZE
>> -	ns_end += PHYS_SDRAM_2_SIZE;
>> -#endif
>> +	ulong ns_end;
>> +	phys_size_t dram_size;
>> +
>> +	board_phys_sdram_size(&dram_size);
> 
> Emanuele: does this change has any impact on the memory size detection we have
> implemented in our i.MX95 based boards?
> 
> Peng: board_phys_sdram_size() in board/toradex/verdin-imx95/verdin-imx95.c
> 
It won't have impact on the memory size detection. It uses the output of 
memory size detection for selection correct address for trampoline buffer.
Previously trampoline buffer uses PHYS_SDRAM_SIZE which is defined as 
2GB - 256MB, if the real DDR size detected at runtime is less than 
PHYS_SDRAM_SIZE (for example 1GB), this buffer address is invalid.

Best regards,
Ye Li

> Francesco
>