On 15/02/2017 12:57, 水中有泪 wrote:
Hi Haikun Wang,
I have a question about the source of uboot.
http://lists.denx.de/pipermail/u-boot/2015-June/217446.html
u32 __iomem *dcfg_ccsr = (u32 __iomem *)DCFG_BASE;
val = in_le32(dcfg_ccsr + DCFG_RCWSR13 / 4);
The question is this,
why does DCFG_RCWSR13 device by 4.
because dcfg_ccsr is defined as u32* (pointer to a 32 bits integer).
If dcfg_ccsr had been declared as a u8* or a void*, then the division by
4 would have not been needed.
JJ
(1)dcfg_ccsr is the base address of Dcfg_ccsr
(2)DCFG_RCWSR13 is the offset of Dcfg_rcwsr13
So I think the next is right
val = in_le32(dcfg_ccsr + DCFG_RCWSR13);
Pardon me my clumsiness.
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