diff options
| author | Macpaul Lin <macpaul@andestech.com> | 2011-10-19 20:41:11 +0000 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2011-10-22 00:54:45 +0200 |
| commit | afc1ce82885698c61946c0cab99aac3547ef78ea (patch) | |
| tree | 89877d371b31068ff89546f85e628939ff6da41f /README | |
| parent | 5f1719c1054282a0e11430956aa0b72009d0aab8 (diff) | |
doc/README: documents and readme for NDS32 arch
Documents and READMEs for NDS32 architecture.
It patch also provides usage of SoC AG101 and board ADP-AG101.
Signed-off-by: Macpaul Lin <macpaul@andestech.com>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 24 |
1 files changed, 21 insertions, 3 deletions
@@ -183,6 +183,10 @@ Directory Hierarchy: /mips32 Files specific to MIPS32 CPUs /xburst Files specific to Ingenic XBurst CPUs /lib Architecture specific library files + /nds32 Files generic to NDS32 architecture + /cpu CPU specific files + /n1213 Files specific to Andes Technology N1213 CPUs + /lib Architecture specific library files /nios2 Files generic to Altera NIOS2 architecture /cpu CPU specific files /lib Architecture specific library files @@ -3156,7 +3160,7 @@ Low Level (hardware related) configuration options: globally (CONFIG_CMD_MEM). - CONFIG_SKIP_LOWLEVEL_INIT - [ARM, MIPS only] If this variable is defined, then certain + [ARM, NDS32, MIPS only] If this variable is defined, then certain low level initializations (like setting up the memory controller) are omitted and/or U-Boot does not relocate itself into RAM. @@ -3723,8 +3727,8 @@ details; basically, the header defines the following image properties: Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS, INTEGRITY). * Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86, - IA64, MIPS, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; - Currently supported: ARM, AVR32, Intel x86, MIPS, Nios II, PowerPC). + IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; + Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC). * Compression Type (uncompressed, gzip, bzip2) * Load Address * Entry Point @@ -4417,6 +4421,20 @@ On Nios II, the ABI is documented here: Note: on Nios II, we give "-G0" option to gcc and don't use gp to access small data sections, so gp is free. +On NDS32, the following registers are used: + + R0-R1: argument/return + R2-R5: argument + R15: temporary register for assembler + R16: trampoline register + R28: frame pointer (FP) + R29: global pointer (GP) + R30: link register (LP) + R31: stack pointer (SP) + PC: program counter (PC) + + ==> U-Boot will use R10 to hold a pointer to the global data + NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope, or current versions of GCC may "optimize" the code too much. |