In message 464DBFC8.4050708@freescale.com you wrote:
So the question is: do we want U-Boot to use this node to determine how much RAM there is, or do we want U-Boot to determine how much RAM there is and update this node?
Tradition is that U-Boot will determine how much RAM there is, and I definitely want to keep it that way. Among other things, this is a cheap and yet still pretty efficient protection against most types of RAM errors.
I still don't see how it's important. If the device tree is on slow memory, so what? You
Timu, there is lots of code in U-Boot that you haven't seen yet...
have to read it sooner or later. If your board can't handle this feature, then don't enable it, and configure U-Boot the "old fashioned way".
Having to read it later (after relocation into RAM) may be *significantly* faster. We can then use buffering, while we may have to use repeated small reads (repeated for each element we're looking up) while running from ROM. Remember that there is more things than just NOR flash. Data may be stored in slow serial devices like EEPROM on I2C, or serial flash on SPI, or NAND flash, etc.
Best regards,
Wolfgang Denk