On Sun, 13 Feb 2005 14:02:16 +0100, Konstantin Kletschke lists@ku-gbr.de wrote:
Am 2005-02-12 14:02 -0700 schrieb Grant Likely:
arch/arm/boot/compressed/head.S. You will see a branch to cache_on at line 287 before decompress_kernel at line 310. (2.6.10) According to the comment on line 422 the page tables are setup for wherever the compressed image is; including if it is in FLASH.
Yes I see. But I don't understand the assembler code really yet. Do you mean "add r0, r3, r2, lsl #2" by line 422, where addresses above 0x10040000 (there my kernel lives) are added to cacheable area?
Sorry; I meant line 412. That block of code adds a cache mapping to where the PC is currently running. This means that the compressed image is cached. Note: this cache enable is for uncompressing the kernel; the caches are reconfigured inside the kernel itself.
Linux can spew a lot of log messages; I suspect your time difference would be more bounded by the baud rate of the port rather than the serial device driver itself. U-boot on the other had is quite a bit
T thought also and measured and my result is the same.
???
Cheers, g.