Greetings,
I've gotten a new custom OMAP4 board and can't get the SDRAM to work. My plan is to retest part of this on a 4460 ES1.1 Pandaboard next week but wanted to put a feeler out now to see if this is known. I've see this today using DENX Mainline u-boot and u-boot-arm/master.
I'm currently on u-boot-arm/master: U-Boot SPL 2013.04-rc2-14354-gf2e8a87-dirty (Apr 26 2013 - 18:37:55)
I have one case that works. An older board (whose CPU I think is identical to the Panda mentioned above). Using pre-canned SDRAM/EMIFS settings this seems to work. However with what seems to be a new CPU the pre-canned settings hang (it seems in omap_sdram_size()).
So I tried to use the SDRAM auto-detect modes:
#undef CONFIG_SYS_EMIF_PRECALCULATED_TIMING_REGS #define CONFIG_SYS_AUTOMATIC_SDRAM_DETECTION (I've tried it with and without CONFIG_SYS_DEFAULT_LPDDR2_TIMINGS and see no difference.)
It still hangs in omap_sdram_size() on both the old and new CPUs but interestingly the new one reports:
EMIF1 CS0 Micron LPDDR2-S4 512 MB get_mr: EMIF1 cs 1 mr 80000000 val 0xffffffff EMIF2 CS0 Micron LPDDR2-S4 512 MB get_mr: EMIF2 cs 1 mr 80000000 val 0xffffffff emif1_size 0x20000000 emif2_size 0x20000000 <<dmm_init() EMIF1 en: 1, EMIF2 en: 1
When I try that auto-detect mode on the old CPU I get: EMIF1 CS0 Micron LPDDR2-S4 256 MB EMIF1 CS1 Micron LPDDR2-S4 256 MB EMIF2 CS0 Micron LPDDR2-S4 256 MB EMIF2 CS1 Micron LPDDR2-S4 256 MB
Are the SDRAM auto-detect modes expected to work on OMAP4460ES1.1?
I'll report the Panda testing next week.
Thanks -Mike Cashwell