Hello, We have a platform similar to MPC885ADS (xith Kernel version 2.4.26) except that : - the RAM is at 0x0300 0000 (size 0x10000000) - the flash is at 0x0280 0000 (size 0x00200000) - IMMR = 0x0220 0000
After u-boot on MPC885ADS, we get the following platform information : - RAM at 0 size 0x0080 0000 - FLASH at 0xFE00 0000 size 0x00200000 - IMMR at 0xFF00 0000 This information is different from the documentation of MPC885ADS : - FLASH at 0x0280 0000 size 0x00800000 - IMMR at 0x0220 0000 1) in fads.h of u-boot, it is specified that RAM __must_ start at 0 : it isn't true on our board : - can linux work with RAM not beginning at 0 on this board ? - what modifications should we make in the kernel to accept RAM at 0x0300 0000 ? 2) is brd_info the only structure given to kernel by u-boot ? That is to say is it the only way for the kernel to have information about the boad ? 4) are the following values important if CONFIG_HIGHMEM is not defined (they are automatically generated by our Metrowerks PCS tool in autoconf.h ) ? #define CONFIG_HIGHMEM_START 0xfe000000 #define CONFIG_LOWMEM_SIZE 0x30000000 #define CONFIG_KERNEL_START 0xc0000000 #define CONFIG_TASK_SIZE 0x80000000 Should we change these values if CONFIG_HIGHMEM is not defined ? 5) is the base value of IMMR very important (real value in u-boot different from documentation) ? Thanks really for your help. Sophie CARAYOL.
