Hi Tom, On 20 November 2014 14:37, Tom Rini <tr...@ti.com> wrote: > On Wed, Nov 12, 2014 at 03:14:35PM -0700, Simon Glass wrote: > > [snip, and sorry for the late reply] >> What I am talking about here is the memory for U-Boot - i.e. how does >> U-Boot know how much memory is available. The scheme here is that you >> can have a board ID which controls this, with the U-Boot device tree >> allowing the options to be specified (i.e. the mapping from board ID >> to SDRAM banks) > > OK. So what I'm getting at is how is this different from other boards > where we say "Oh, this is $FOO, it has $X LPDRR2 RAM" and "Oh, this is > $BAR, it has $Y DDR3 RAM" ? The only thing I'm able to think of is that > we cannot call get_ram_size() to see the _size_ of the RAM after doing > $whatever to see what board we're on and doing the right configuration > for the DDR controller or whatever.
Yes the memory type can go in the FDT too (and does for snow and pit). That's right, we can call get_ram_size() but only within the known boundaries. If we try to probe a 2GB machine as if it has 4GB of RAM it will hang. So we have to *know*. Regards, Simon _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
