Hi List, Hi Tsi-Ching Liew,
I'm using u-boot 1.3.2 (trunk) on my application in order to boot the freescale linux kernel for mcf547x cpus. My application has a lot of memory (256MB) and this causes difficulties to start the linux kernel.
The Head.S code of the mcf547x Linux Kernel allows a one-to-one TLB map for the first 16MB of memory (mcf547x can use up to 1M for page). From this observation it is mandatory that U-BOOT should call the kernel allowing all structures (board descr., intrd, env and command line) onto the first 16M of physical RAM.
The solutions can be:
- to use the env variables bootm_low = 0 and bootm_size = 0x1000000 (16M) - modify the code of do_bootm function in order to limitate mem_size to 16M - Pray the Freescale to modify the kernel code in order to use a better and more flexible initialization code.
I'm studying for smart modifications for Kernel and U-Boot (that hasn't guilt).
Best regards,
luigi