On Sun, 2014-04-13 at 23:45 -0400, Shixin Zeng wrote:
> Hi,
>
> I compiled the current u-boot from
> https://github.com/jwrdegoede/u-boot-sunxi.git for cubieboard2, and
> wrote it to the SD card. I was trying to boot the kernel on my
> computer over network by tftp, however it failed when I ran "dhcp" or
> "tftp" command in uboot with a tons of:
>
>
> ERROR: v7_dcache_inval_range - start address is not aligned - 0x7fb677e0
> ERROR: v7_dcache_inval_range - stop address is not aligned - 0x7fb67820
I'm seeing this on Cubieboard2 and Cubietruck. It appears to be down to
a change to the upstream designware driver:
commit 50b0df814b0f75c08a3d45a017016a75af3edb5d
Author: Alexey Brodkin <alexey.brod...@synopsys.com>
Date: Wed Jan 22 20:49:09 2014 +0400
net/designware: make driver compatible with data cache
Up until now this driver only worked with data cache disabled.
To make it work with enabled data cache following changes were required:
* Flush Tx/Rx buffer descriptors their modification
* Invalidate Tx/Rx buffer descriptors before reading its values
* Flush cache for data passed from CPU to GMAC
* Invalidate cache for data passed from GMAC to CPU
http://git.denx.de/?p=u-boot.git;a=commit;h=50b0df814b0f75c08a3d45a017016a75af3edb5d
I suppose this was only tested on some architecture which allows DMA
flush/invaidation at a fairly fine granularity (at least down to 4 byte
boundaries)
Making sure that struct dw_eth_dev is DMA aligned helps with the
invalidate of the descriptors in dw_eth_recv (see below) but with that
the invalidate of the txrx_status field in dw_eth_send is still
problematic -- the field is only 4 bytes, so although the descriptor is
aligned the end is not.
Ian.
commit 8878d858ede12584b885fa9439f9093bf2186a90
Author: Ian Campbell <i...@hellion.org.uk>
Date: Sat Apr 19 14:16:04 2014 +0100
net/designware: ensure device private data is DMA aligned.
struct dw_eth_dev contains fields which are accessed via DMA, so make sure
it
is aligned to a dma boundary. Without this I see:
ERROR: v7_dcache_inval_range - start address is not aligned - 0x7fb677e0
Signed-off-by: Ian Campbell <ian.campb...@citrix.com>
diff --git a/drivers/net/designware.c b/drivers/net/designware.c
index 6ece479..1120f70 100644
--- a/drivers/net/designware.c
+++ b/drivers/net/designware.c
@@ -412,7 +412,8 @@ int designware_initialize(ulong base_addr, u32 interface)
* Since the priv structure contains the descriptors which need a strict
* buswidth alignment, memalign is used to allocate memory
*/
- priv = (struct dw_eth_dev *) memalign(16, sizeof(struct dw_eth_dev));
+ priv = (struct dw_eth_dev *) memalign(ARCH_DMA_MINALIGN,
+ sizeof(struct dw_eth_dev));
if (!priv) {
free(dev);
return -ENOMEM;
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