arm: at91sam9n12: change EBI IO to high drive mode

As both the DDR SDRAM and NAND flash connect to EBI on at91sam9n12 and share the lower 8 bits data line. If use low drive of the data line, it will cause DDR data access corrupt in lower address, so change the data line to high drive mode This will fix the Linux kernel boot issue when use Lower address Signed-off-by: Bo Shen <voice.shen@atmel.com> Acked-by: Andreas Bießmann <andreas.devel@googlemail.com>

arm: at91sam9n12: change EBI IO to high drive mode
As both the DDR SDRAM and NAND flash connect to EBI on at91sam9n12 and share the lower 8 bits data line. If use low drive of the data line, it will cause DDR data access corrupt in lower address, so change the data line to high drive mode This will fix the Linux kernel boot issue when use Lower address Signed-off-by: Bo Shen <voice.shen@atmel.com> Acked-by: Andreas Bießmann <andreas.devel@googlemail.com>
Bo Shen · Tom Rini
1 parent fdf86c202c
Showing 1 changed file with 1 additions and 1 deletions Side-by-side Diff
board/atmel/at91sam9n12ek/at91sam9n12ek.c
@@ -59,7 +59,7 @@
 	/* Configure databus */
 	csa &= ~AT91_MATRIX_NFD0_ON_D16; /* nandflash connect to D0~D15 */
 	/* Configure IO drive */
-	csa &= ~AT91_MATRIX_EBI_EBI_IOSR_NORMAL;
+	csa |= AT91_MATRIX_EBI_EBI_IOSR_NORMAL;
  
 	writel(csa, &matrix->ebicsa);
...	...	@@ -59,7 +59,7 @@
59	59	/* Configure databus */
60	60	csa &= ~AT91_MATRIX_NFD0_ON_D16; /* nandflash connect to D0~D15 */
61	61	/* Configure IO drive */
62		- csa &= ~AT91_MATRIX_EBI_EBI_IOSR_NORMAL;
	62	+ csa \|= AT91_MATRIX_EBI_EBI_IOSR_NORMAL;
63	63
64	64	writel(csa, &matrix->ebicsa);
65	65