[U-Boot-Users] purpose of calling 'cache_post_dinvalidate' before writing

Hi,

I just want to know the purpose of calling 'invalidate' (cache_post_dinvalidate) command before writing cached area in file 'cache_8xx.S'.

The code snippet is appended for reference.

Regards,

Sachin Rane

cache_post_test1:

mflr r0

stw r0, 4(r1)

stwu r3, -4(r1)

stwu r4, -4(r1)

bl cache_post_dwb

bl cache_post_dinvalidate

/* Write the negative pattern to the test area */

lwz r0, 0(r1)

mtctr r0

li r0, 0xff

lwz r3, 4(r1)

subi r3, r3, 1

1:

stbu r0, 1(r3)

bdnz 1b