Re: [U-Boot] [PATCH] MMC: PL180: Fix infinite loop with VExpress extended fifo implementation

On Wed, 2011-10-05 at 10:30 +0100, Pawel Moll wrote:

Hi Tixy,

...

One possible fix is to add some build time configuration to change SDI_FIFO_BURST_SIZE for the new implementation.

You can also detect the configuration in runtime, basing on PeriphID:

http://infocenter.arm.com/help/topic/com.arm.doc.ddi0172a/i1024149.html

Configuration == 0 (ID == 0x00041180) -> FIFO length = 16 * 4 Configuration == 1 (ID == 0x01041180) -> FIFO length = 128 * 4

That's useful to know. The PL180 code is also used for U8500, I don't know if that implements the peripheral ID register; though I guess any probing could be limited to vexpress anyway.

However, I think that if smaller and simpler code will work on all hardware then that is preferable.