[U-Boot] [[PATCH]pandaboard: 1/1] Modification of Elpida DDR2 RAM for Pandaboard-ES Rev B3

[Tom Rini <trini@ti.com>]

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On 10/29/2013 10:17 AM, Hardik Patel wrote:
> Tom, Dan,
> 
> Thanks for your feedback on patch.
> 
> If I understand correctly, you are suggesting to put static timing
> values for RevB3(instead of putting it for auto detection) in
> "emif_get_reg_dump"
>  and "emif_get_dmm_regs_sdp"  functions as we do it for other panda
> revisions.
> 
> We have already figured out timing values for Elpida RAM on Rev B3.
> However, We need a way to differentiate "Rev-B2" and "Rev-B3", as both
> boards are very similar. We have checked that "omap_revision()" returns
> same value on both B2 and B3.
> 
> We have found one difference between both revisions that we may use.
> GPIO171 is '0' for Rev B1/B2, and it comes to '1' for Rev B3. We have
> verified this between two boards.
> * GPIO2, GPIO3, GPIO171, GPIO48, GPIO182: 0 0 0 1 1 => B1/B2
> * GPIO2, GPIO3, GPIO171, GPIO48, GPIO182: 0 0 1 1 1 => B3
> 
> Please suggest a correct way to differentiate between B2 and B3 in
> "sdram_elpida.c", so that patch gets accepted.
> Should we export and use "get_board_revision()" along with
> "omap_revision()" in "sdram_elpida.c" to differentiate between B2 and
> B3? In current code "get_board_revision()" is not exported to
> "sdram_elpida.c".

Note that emif_get_device_details is a weak function, so you can just
add one to board/ti/panda/panda.c that will provide the correct data out
of sdram_elpida.c, and not have to modify the function in sdram_elpida.c

- -- 
Tom
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