u-boot.git/arch/nios2, branch v2010.09

nios2: fix out of reach case for do_reset

2010-08-20T02:15:49Z

There is a limitation (or bug?) of nios2 toolchain. The nios2 gcc didn't generate correct code when the reset vector is passed as a constant. It just generated a direct "call", which was wrong when the reset vector was not located in the same 256MB span as u-boot. The "Nios II Processor Reference Handbook" said, "call can transfer execution anywhere within the 256 MByte range determined by PC31..28. The Nios II GNU linker does not automatically handle cases in which the address is out of this range." So we have to use registered "callr" instruction to do the job. Signed-off-by: Thomas Chou Signed-off-by: Scott McNutt

nios2: fix bootm error on fdt args

2010-08-20T02:15:49Z

We should check argv[3] only if there are enough args. Otherwise, it might cause invalid memory access fault. Signed-off-by: Thomas Chou Signed-off-by: Scott McNutt

nios2: add gpio_request

2010-07-12T15:30:51Z

This will be used by nand_plat. Signed-off-by: Thomas Chou Signed-off-by: Scott McNutt

nios2: add fdt support

2010-07-12T15:30:51Z

This patch adds fdt support to boot linux, followed Michal's work on microblaze. Signed-off-by: Thomas Chou Signed-off-by: Scott McNutt

nios2: use gc sections to reduce image size

2010-07-12T15:30:51Z

Follow the discussion of Charles Manning and Mike Frysinger. Using gc_sections helps reduce image size. Configuring for nios2-generic board... Before, text data bss dec hex filename 123979 3724 22892 150595 24c43 /tmp/u-boot/u-boot After, text data bss dec hex filename 115983 3800 22732 142515 22cb3 /tmp/u-boot/u-boot Signed-off-by: Thomas Chou Signed-off-by: Scott McNutt

Make sure that argv[] argument pointers are not modified.

2010-07-04T21:55:42Z

The hush shell dynamically allocates (and re-allocates) memory for the argument strings in the "char *argv[]" argument vector passed to commands. Any code that modifies these pointers will cause serious corruption of the malloc data structures and crash U-Boot, so make sure the compiler can check that no such modifications are being done by changing the code into "char * const argv[]". This modification is the result of debugging a strange crash caused after adding a new command, which used the following argument processing code which has been working perfectly fine in all Unix systems since version 6 - but not so in U-Boot: int main (int argc, char **argv) { while (--argc > 0 && **++argv == '-') { /* ====> */ while (*++*argv) { switch (**argv) { case 'd': debug++; break; ... default: usage (); } } } ... } The line marked "====>" will corrupt the malloc data structures and usually cause U-Boot to crash when the next command gets executed by the shell. With the modification, the compiler will prevent this with an error: increment of read-only location '*argv' N.B.: The code above can be trivially rewritten like this: while (--argc > 0 && **++argv == '-') { char *arg = *argv; while (*++arg) { switch (*arg) { ... Signed-off-by: Wolfgang Denk Acked-by: Mike Frysinger

nios2: allow STANDALONE_LOAD_ADDR overriding

2010-05-28T14:56:04Z

This patch allows users to override default STANDALONE_LOAD_ADDR. The gcclibdir path was duplicated in the standalone Makefile and can be removed. Signed-off-by: Thomas Chou Signed-off-by: Scott McNutt

nios2: fix div64 issue for gcc4

2010-05-28T14:56:03Z

This patch fixes the run-time error on div64 when built with gcc4, which was reported by jhwu0625 on nios forum. It merges math support from libgcc of gcc4. This patch is copied from nios2-linux. It works with both gcc3 and gcc4. The old mult.c, divmod.c and math.h are removed. Signed-off-by: Thomas Chou Signed-off-by: Scott McNutt

nios2: fix r15 issue for gcc4

2010-05-28T14:56:03Z

The "-ffixed-r15" option doesn't work well for gcc4. Since we don't use gp for small data with option "-G0", we can use gp as global data pointer. This allows compiler to use r15. It is necessary for gcc4 to work properly. Signed-off-by: Thomas Chou Signed-off-by: Scott McNutt

nios2: add gpio support

2010-05-28T14:56:03Z

This patch adds driver for a trivial gpio core, which is described in http://nioswiki.com/GPIO. It is used for gpio led and nand flash interface in u-boot. When CONFIG_SYS_GPIO_BASE is not defined, board may provide its own driver. Signed-off-by: Thomas Chou Tested-by: Ian Abbott Signed-off-by: Scott McNutt