diff options
| author | Haavard Skinnemoen <hskinnemoen@atmel.com> | 2008-01-23 17:20:14 +0100 |
|---|---|---|
| committer | Haavard Skinnemoen <hskinnemoen@atmel.com> | 2008-02-05 12:14:27 +0100 |
| commit | d38da537943cd36356b9d3d9d9b60533554b81d8 (patch) | |
| tree | 6263c715346047e4cda757dff839f4e1052652b7 /board/atmel | |
| parent | 61151cccb660cdb06a07fb283de6089913d7bde0 (diff) | |
| download | blackbird-obmc-uboot-d38da537943cd36356b9d3d9d9b60533554b81d8.tar.gz blackbird-obmc-uboot-d38da537943cd36356b9d3d9d9b60533554b81d8.zip | |
AVR32: Make SDRAM refresh rate configurable
The existing code assumes the SDRAM row refresh period should always
be 15.6 us. This is not always true, and indeed on the ATNGW100, the
refresh rate should really be 7.81 us.
Add a refresh_period member to struct sdram_info and initialize it
properly for both ATSTK1000 and ATNGW100. Out-of-tree boards will
panic() until the refresh_period member is updated properly.
Big thanks to Gerhard Berghofer for pointing out this issue.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Diffstat (limited to 'board/atmel')
| -rw-r--r-- | board/atmel/atngw100/atngw100.c | 3 | ||||
| -rw-r--r-- | board/atmel/atstk1000/atstk1000.c | 3 |
2 files changed, 6 insertions, 0 deletions
diff --git a/board/atmel/atngw100/atngw100.c b/board/atmel/atngw100/atngw100.c index bd4b6b4ce5..1ccbe2c181 100644 --- a/board/atmel/atngw100/atngw100.c +++ b/board/atmel/atngw100/atngw100.c @@ -23,6 +23,7 @@ #include <asm/io.h> #include <asm/sdram.h> +#include <asm/arch/clk.h> #include <asm/arch/gpio.h> #include <asm/arch/hmatrix2.h> @@ -40,6 +41,8 @@ static const struct sdram_info sdram = { .trcd = 2, .tras = 5, .txsr = 5, + /* 7.81 us */ + .refresh_period = (781 * (SDRAMC_BUS_HZ / 1000)) / 100000, }; int board_early_init_f(void) diff --git a/board/atmel/atstk1000/atstk1000.c b/board/atmel/atstk1000/atstk1000.c index 6618963cc0..28f64c4a6f 100644 --- a/board/atmel/atstk1000/atstk1000.c +++ b/board/atmel/atstk1000/atstk1000.c @@ -23,6 +23,7 @@ #include <asm/io.h> #include <asm/sdram.h> +#include <asm/arch/clk.h> #include <asm/arch/gpio.h> #include <asm/arch/hmatrix2.h> @@ -40,6 +41,8 @@ static const struct sdram_info sdram = { .trcd = 2, .tras = 5, .txsr = 5, + /* 15.6 us */ + .refresh_period = (156 * (SDRAMC_BUS_HZ / 1000)) / 10000, }; int board_early_init_f(void) |
