[U-Boot-Users] [PATCH] PPC4xx: Add a non-EEPROM-driven SDRAM Initialization Function for the 405EX(r).

[Stefan Roese]

On Monday 19 May 2008, Grant Erickson wrote:
> > And I'm wondering if this code really should go into this
> > file "44x_spd_ddr2.c". Since now a 405 variant (405EX) can use this code
> > too we should probably change the name to "4xx_spd_ddr2.c". And with this
> > new fixed DDR2 init code it the SPD is not really fitting anymore. So the
> > new name should probably be "4xx_ddr2.c".
> >
> > Comments welcome.
>
> This controller works with both DDR and DDR2 memories, so that might be
> misleading.

Right. But we need to differentiate from the "DDR only" controller used on 
440GP/GX/EP/GR.

> What I'd like to see is a move away from processor-based 
> CONFIG_ and towards feature-based CONFIG_. In that way, we can avoid
> ever-growing lists like:
>
>     #if defined(CONFIG_PPCX) || defined(CONFIG_PPCY) ||
> defined(CONFIG_PPCZ)

Full ack.

> However, what's needed then are convenient mnemonics for various
> cores/blocks. EMAC works well enough for that block. However,
> DDR/DDR2/SDRAM seem too generic. Does AMCC call this block something
> internally that's leaked out? I see "Denali" used for one memory controller
> core, correct? Or is that a board name? 

Denali is the name of the DDR(2) controller core IP supplier used on 440EPx 
etc. Since the "other" DDR(2) controller core comes from IBM, we should 
probably name it "4xx_ibm_ddr2.c". Not sure about ddr2 vs. ddr though.

Best regards,
Stefan

=====================================================================
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
=====================================================================