On Wednesday, May 16, 2007 3:11 PM Timur Tabi wrote:
I'm not asking if I can boot from RAM, I'm asking why would someone think it could be done?
If
anything, 14.2.1 re-inforces my point: if booting from RAM doesn't make sense, why are
so
many board header files configured to enable it?
It's too strong a statement "booting from RAM doesn't make sense". Of course, under "booting from RAM" I mean that u-boot runs from RAM and thus its image must be compiled this way. U-boot image and environment variables can be still on the flash (I assume the system has one) and some other (first stage) bootloader fetches u-boot from there, copies to RAM and starts it. Note that u-boot environment variables stay on the flash all the time.
As a matter of fact, such scheme is widely used for Xilinx FPGA embedded cores (both Microblaze and PPC) as well as for ARM CPUs. It's not approved by many experts and I don't wish to start discussion here whether such approach is the best in certain circumstances, but it definitely makes a lot of sense.
Thanks,
Leonid.