X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Froms%2Fu-boot%2Fdoc%2FREADME.NDS32;fp=qemu%2Froms%2Fu-boot%2Fdoc%2FREADME.NDS32;h=b2b58fc228fbf7a48dcdada2d4bea311cbf6d25b;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git diff --git a/qemu/roms/u-boot/doc/README.NDS32 b/qemu/roms/u-boot/doc/README.NDS32 new file mode 100644 index 000000000..b2b58fc22 --- /dev/null +++ b/qemu/roms/u-boot/doc/README.NDS32 @@ -0,0 +1,41 @@ +NDS32 is a new high-performance 32-bit RISC microprocessor core. + +http://www.andestech.com/ + +AndeStar ISA +============ +AndeStar is a patent-pending 16-bit/32-bit mixed-length instruction set to +achieve optimal system performance, code density, and power efficiency. + +It contains the following features: + - Intermixable 32-bit and 16-bit instruction sets without the need for + mode switch. + - 16-bit instructions as a frequently used subset of 32-bit instructions. + - RISC-style register-based instruction set. + - 32 32-bit General Purpose Registers (GPR). + - Upto 1024 User Special Registers (USR) for existing and extension + instructions. + - Rich load/store instructions for... + - Single memory access with base address update. + - Multiple aligned and unaligned memory accesses for memory copy and stack + operations. + - Data prefetch to improve data cache performance. + - Non-bus locking synchronization instructions. + - PC relative jump and PC read instructions for efficient position independent + code. + - Multiply-add and multiple-sub with 64-bit accumulator. + - Instruction for efficient power management. + - Bi-endian support. + - Three instruction extension space for application acceleration: + - Performance extension. + - Andes future extensions (for floating-point, multimedia, etc.) + - Customer extensions. + +AndesCore CPU +============= +Andes Technology has 4 families of CPU cores: N12, N10, N9, N8. + +For details about N12 CPU family, please check doc/README.N1213. + +The NDS32 ports of u-boot, the Linux kernel, the GNU toolchain and +other associated software are actively supported by Andes Technology Corporation.