[brcm47xx] fix boot failure on some boards

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13013 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 108 insertions, 0 deletions

diff --git a/target/linux/brcm47xx/patches-2.6.25/800-fix_cfe_detection.patch b/target/linux/brcm47xx/patches-2.6.25/800-fix_cfe_detection.patch
new file mode 100644
index 0000000000..e72f99e803
--- /dev/null
+++ b/target/linux/brcm47xx/patches-2.6.25/800-fix_cfe_detection.patch
@@ -0,0 +1,108 @@
+--- a/arch/mips/bcm47xx/prom.c
++++ b/arch/mips/bcm47xx/prom.c
+@@ -32,6 +32,7 @@
+ #include <asm/fw/cfe/cfe_error.h>
+ 
+ static int cfe_cons_handle;
++static void (* __prom_putchar)(char c);
+ 
+ const char *get_system_type(void)
+ {
+@@ -40,65 +41,40 @@
+ 
+ void prom_putchar(char c)
+ {
++	if (__prom_putchar)
++		__prom_putchar(c);
++}
++
++void prom_putchar_cfe(char c)
++{
+ 	while (cfe_write(cfe_cons_handle, &c, 1) == 0)
+ 		;
+ }
+ 
+-static __init void prom_init_cfe(void)
++static __init int prom_init_cfe(void)
+ {
+ 	uint32_t cfe_ept;
+ 	uint32_t cfe_handle;
+ 	uint32_t cfe_eptseal;
+-	int argc = fw_arg0;
+-	char **envp = (char **) fw_arg2;
+-	int *prom_vec = (int *) fw_arg3;
+-
+-	/*
+-	 * Check if a loader was used; if NOT, the 4 arguments are
+-	 * what CFE gives us (handle, 0, EPT and EPTSEAL)
+-	 */
+-	if (argc < 0) {
+-		cfe_handle = (uint32_t)argc;
+-		cfe_ept = (uint32_t)envp;
+-		cfe_eptseal = (uint32_t)prom_vec;
+-	} else {
+-		if ((int)prom_vec < 0) {
+-			/*
+-			 * Old loader; all it gives us is the handle,
+-			 * so use the "known" entrypoint and assume
+-			 * the seal.
+-			 */
+-			cfe_handle = (uint32_t)prom_vec;
+-			cfe_ept = 0xBFC00500;
+-			cfe_eptseal = CFE_EPTSEAL;
+-		} else {
+-			/*
+-			 * Newer loaders bundle the handle/ept/eptseal
+-			 * Note: prom_vec is in the loader's useg
+-			 * which is still alive in the TLB.
+-			 */
+-			cfe_handle = prom_vec[0];
+-			cfe_ept = prom_vec[2];
+-			cfe_eptseal = prom_vec[3];
+-		}
+-	}
+ 
+-	if (cfe_eptseal != CFE_EPTSEAL) {
+-		/* too early for panic to do any good */
+-		printk(KERN_ERR "CFE's entrypoint seal doesn't match.");
+-		while (1) ;
+-	}
++	cfe_eptseal = (uint32_t) fw_arg3;
++	cfe_handle = (uint32_t) fw_arg0;
++	cfe_ept = (uint32_t) fw_arg2;
++
++	if (cfe_eptseal != CFE_EPTSEAL)
++		return -1;
+ 
+ 	cfe_init(cfe_handle, cfe_ept);
++	return 0;
+ }
+ 
+-static __init void prom_init_console(void)
++static __init void prom_init_console_cfe(void)
+ {
+ 	/* Initialize CFE console */
+ 	cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
+ }
+ 
+-static __init void prom_init_cmdline(void)
++static __init void prom_init_cmdline_cfe(void)
+ {
+ 	char buf[CL_SIZE];
+ 
+@@ -146,9 +122,12 @@
+ 
+ void __init prom_init(void)
+ {
+-	prom_init_cfe();
+-	prom_init_console();
+-	prom_init_cmdline();
++	if (prom_init_cfe() == 0) {
++		prom_init_console_cfe();
++		prom_init_cmdline_cfe();
++		__prom_putchar = prom_putchar_cfe;
++	}
++
+ 	prom_init_mem();
+ }
+