Hi Kever,
On 4/2/19 10:46 AM, Kever Yang wrote:
Rockchip SOC's mmc controller does not support read data from mmc to sram, we need a bounce buffer(in sdram), and then copy to sram.
what exactly is the limitation here? I mean a DMA engine does not care where it is copying to.
Additionally I was observing recently, that copying from SD card to SRAM works on RK3399 boards with 4 GB of RAM. I see a data error in dwmci_data_transfer() only on 2 GB boards.
Therefore my question: Is this maybe just a problem of the memory area not being mapped in SPL?
Thanks, Christoph
Signed-off-by: Kever Yang kever.yang@rock-chips.com
common/bouncebuf.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/common/bouncebuf.c b/common/bouncebuf.c index a7098e2caf..364fb17c96 100644 --- a/common/bouncebuf.c +++ b/common/bouncebuf.c @@ -26,6 +26,18 @@ static int addr_aligned(struct bounce_buffer *state) return 0; }
+#ifdef CONFIG_ARCH_ROCKCHIP
- /*
* Rockchip SOC's mmc controller does not support read data* from mmc to sram, we need a bounce buffer(in sdram), and then* copy to sram.*/- if (((ulong)state->user_buffer & 0xfff80000) ==
CONFIG_ROCKCHIP_IRAM_BASE) {debug("Unsupport IRAM space %p\n", state->user_buffer);return 0;- }
+#endif /* Aligned */ return 1; }