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Clarify reason for direct copy.

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This commit is contained in:
W. Eric Norum
2004-09-28 20:39:47 +00:00
parent 46255e607a
commit cd551b4860
1 changed files with 12 additions and 7 deletions
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src/RTEMS/base/setBootConfigFromPPCBUGNVRAM.c
+12 -7
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@@ -27,7 +27,6 @@ struct ppcbug_nvram {
char BootFilenameString[64];
char ArgumentFilenameString[64];
};
#define PPCBUG_NVRAM ((void *)0xFFE81000)
static char *addr(char *cbuf, rtems_unsigned32 addr)
{
@@ -40,8 +39,6 @@ static char *addr(char *cbuf, rtems_unsigned32 addr)
void
setBootConfigFromPPCBUGNVRAM(void)
{
char *d;
volatile char *s;
static struct ppcbug_nvram nvram;
static char ip_address[INET_ADDRSTRLEN];
static char ip_netmask[INET_ADDRSTRLEN];
@@ -49,12 +46,20 @@ setBootConfigFromPPCBUGNVRAM(void)
static char gateway[INET_ADDRSTRLEN];
/*
* NVRAM must be accessed a byte at a time
* Get network configuation from PPCBUG.
* The 'correct' way to do this would be to issue a .NETCFIG PPCBUG
* system call. Unfortunately it is very difficult to issue such a
* call once RTEMS is up and running so we just copy from the 'known'
* location of the network configuration parameters.
* Care must be taken to access the NVRAM a byte at a time.
*/
s = (volatile char *)PPCBUG_NVRAM;
d = (char *)&nvram;
while (d < ((char *)&nvram + sizeof(nvram)))
{
volatile char *s = (volatile char *)0xFFE81000;
char *d = (char *)&nvram;
while (d < ((char *)&nvram + sizeof nvram))
*d++ = *s++;
}
/*
* Assume that the boot server is also the name server and log server!