[U-Boot] [PATCH 1/7] arm: K3: Avoid use of MCU_PSRAM0 before SYSFW is loaded

[Andrew F. Davis]

On 2/13/19 2:27 PM, Tom Rini wrote:
> On Wed, Feb 13, 2019 at 12:37:06PM -0600, Andrew F. Davis wrote:
>> On HS devices the 512b region of reset isolated memory called
>> MCU_PSRAM0 is firewalled by default. Until SYSFW is loaded we
>> cannot use this memory. It is only used to store a single value
>> left at the end of SRAM by ROM that will be needed later. Save
>> that value to a global variable stored in the .data section.
>> This section is used as .bss will be cleared between saving
>> this value and using it.
>>
>> Signed-off-by: Andrew F. Davis <afd at ti.com>
>> ---
>>  arch/arm/mach-k3/am6_init.c                  | 8 +++-----
>>  arch/arm/mach-k3/include/mach/am6_hardware.h | 3 ---
>>  2 files changed, 3 insertions(+), 8 deletions(-)
>>
>> diff --git a/arch/arm/mach-k3/am6_init.c b/arch/arm/mach-k3/am6_init.c
>> index a5553190b4..462538e45d 100644
>> --- a/arch/arm/mach-k3/am6_init.c
>> +++ b/arch/arm/mach-k3/am6_init.c
>> @@ -49,11 +49,11 @@ static void ctrl_mmr_unlock(void)
>>  	mmr_unlock(CTRL_MMR0_BASE, 7);
>>  }
>>  
>> +u32 bootindex __attribute__((section(".data")));
>> +
> 
> We need a comment above this one so it's clear down the line to others
> why we're doing something odd like this, thanks!
> 

No problem, will add.