mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-10 23:03:29 +09:00
![Wolfgang Denk](/assets/img/avatar_default.png)
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 <wd@denx.de> Acked-by: Mike Frysinger <vapier@gentoo.org>
111 lines
2.2 KiB
C
111 lines
2.2 KiB
C
/*
|
|
* ppmc7xx.c
|
|
* ---------
|
|
*
|
|
* Main board-specific routines for Wind River PPMC 7xx/74xx board.
|
|
*
|
|
* By Richard Danter (richard.danter@windriver.com)
|
|
* Copyright (C) 2005 Wind River Systems
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
#include <netdev.h>
|
|
|
|
|
|
/* Define some MPC107 (memory controller) registers */
|
|
#define MPC107_EUMB_GCR 0xfce41020
|
|
#define MPC107_EUMB_IACKR 0xfce600a0
|
|
|
|
|
|
/* Function prototypes */
|
|
extern void unlock_ram_in_cache( void );
|
|
extern void _start_warm(void);
|
|
|
|
|
|
/*
|
|
* initdram()
|
|
*
|
|
* This function normally initialises the (S)DRAM of the system. For this board
|
|
* the SDRAM was already initialised by board_asm_init (see init.S) so we just
|
|
* return the size of RAM.
|
|
*/
|
|
phys_size_t initdram( int board_type )
|
|
{
|
|
return CONFIG_SYS_SDRAM_SIZE;
|
|
}
|
|
|
|
|
|
/*
|
|
* after_reloc()
|
|
*
|
|
* This is called after U-Boot has been copied from Flash/ROM to RAM. It gives
|
|
* us an opportunity to do some additional setup before the rest of the system
|
|
* is initialised. We don't need to do anything, so we just call board_init_r()
|
|
* which should never return.
|
|
*/
|
|
void after_reloc( ulong dest_addr, gd_t* gd )
|
|
{
|
|
/* Jump to the main U-Boot board init code */
|
|
board_init_r( gd, dest_addr );
|
|
}
|
|
|
|
|
|
/*
|
|
* checkboard()
|
|
*
|
|
* We could do some board level checks here, such as working out what version
|
|
* it is, but for this board we simply display it's name (on the console).
|
|
*/
|
|
int checkboard( void )
|
|
{
|
|
puts( "Board: Wind River PPMC 7xx/74xx\n" );
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* misc_init_r
|
|
*
|
|
* Used for other setup which needs to be done late in the bring-up phase.
|
|
*/
|
|
int misc_init_r( void )
|
|
{
|
|
/* Reset the EPIC and clear pending interrupts */
|
|
out32r(MPC107_EUMB_GCR, 0xa0000000);
|
|
while( in32r( MPC107_EUMB_GCR ) & 0x80000000 );
|
|
out32r( MPC107_EUMB_GCR, 0x20000000 );
|
|
while( in32r( MPC107_EUMB_IACKR ) != 0xff );
|
|
|
|
/* Enable the I-Cache */
|
|
icache_enable();
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* do_reset()
|
|
*
|
|
* Shell command to reset the board.
|
|
*/
|
|
void do_reset( cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[] )
|
|
{
|
|
printf( "Resetting...\n" );
|
|
|
|
/* Disabe and invalidate cache */
|
|
icache_disable();
|
|
dcache_disable();
|
|
|
|
/* Jump to warm start (in RAM) */
|
|
_start_warm();
|
|
|
|
/* Should never get here */
|
|
while(1);
|
|
}
|
|
|
|
int board_eth_init(bd_t *bis)
|
|
{
|
|
return pci_eth_init(bis);
|
|
}
|