[U-Boot-Users] uboot newbie - tqm823 and memory conf question
wd at denx.de
Sun Feb 16 18:59:43 CET 2003
In message <3E4D97E5.4030708 at aehr.com> you wrote:
> I have TQM823L-50 modules, which have a 26bit address / 32 bit I/O
> external bus and I want to hook up external programmable logic, which
> If I understand the MPC823 book correctly there already a "canned"
> memory engine available to "talk" to an SRAM.
> - To which CS is that hooked up to?
That's completely your own choice.
Well, not completely. The TQM8xxL modules use:
CS0 / CS1 for the 2 flash banks
CS2 for SDRAM
CS3 for the CAN controllers (if fit)
So depending if you have CAN on your modules or not you can chose
form CS4...CS7 or from CS3...CS7.
> - What needs to be done to the boot-loader - ppcboot|u-boot?
Strictly speaking, nothing. You can set up the memroy controller for
this CS whenever you need it, i. e. for example in the Linux
deriver's init routine. However, if you want to access the memory
under U-Boot, you should at least add appropriate definitions for
CFG_BR?_PRELIM and CFG_OR?_PRELIM to your board's config file.
> I would really appreciate some help there, since I am just supposed to
> setup the board for our HW guys.
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