On 23 April 2010 15:08, Gurumurthy G M <Gurumurthy.Gowdar@xxxxxxxxxx> wrote: > > > Hi All, > we are porting U-boot 1.2.0 to MIPS32 Au1350 Processor. i am using ELDK 4.1 for MIPS32. > > Thanks wolfgang now am able to compile toolchain for mips after using ELDK for MIPS. > > Now while porting U-boot to Au1350 MIPS32 we are facing following problems mentioned below. > > We have a MIPS CPU which has reset address 0xBFC00000 , this is mapped to NOR flash with XIP in place. The boot block ( ie 0xBFC00000) is in the top block of the NOR flash and its of 16KB. U-Boot shall be put from address 0xBFC00000 in the NOR flash for CPU boot up , since it is the last block (16KB only) we cannot put complete U-Boot , some part of the U-Boot should go to lower blocks . To do this u-boot need to be divided into blocks and we shall provide a jump from the top block to other blocks of NOR flash. We have BDI3000 debugger for flashing the NOR flash and bdiGDB for MIPS. So, your NOR is mapped at: 0xbfc00000 + 16*1024 - 0x00200000 = 0xbfa04000 ? Wouldn't it be simpler to get your hardware engineer(s) to map the NOR flash to a saner address? e.g. 0xbfc00000. > > Is there any NOR flash drivers available which can support the below chip? > > NOR Flash chip : M29W160ET --> AM29BX16 > NOR Flash chip size is 0x00200000 --> 2MB You'll probably have to add an entry for the chip in linux/drivers/mtd/chips/jedec_probe.c and create a mapping driver (plenty of really simple examples in linux/drivers/mtd/maps/). > > MIPS CPU Clock is 660MHz > System Bus is 330MHz > SDRAM bus clock is 165MHz > > > please let me know if am going wrong anywhere or missing out something. > > With Regards, > Gurumurthy Gowdar > KPIT Cummins Infosystems Ltd > > -Graham
