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From 6bd2c73ed31a2dfe7eab04d32c17318a5c62f9d4 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sun, 18 Jul 2010 15:11:26 +0200
Subject: [PATCH 5/5] MIPS: BCM47xx: Remove CFE console
Do not use the CFE console. It causes hangs on some devices like the
Buffalo WHR-HP-G54.
This was reported in https://dev.openwrt.org/ticket/4061 and
https://forum.openwrt.org/viewtopic.php?id=17063
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
arch/mips/bcm47xx/prom.c | 82 +++------------------------------------------
1 files changed, 6 insertions(+), 76 deletions(-)
--- a/arch/mips/bcm47xx/prom.c
+++ b/arch/mips/bcm47xx/prom.c
@@ -31,96 +31,28 @@
#include <asm/fw/cfe/cfe_api.h>
#include <asm/fw/cfe/cfe_error.h>
-static int cfe_cons_handle;
-
const char *get_system_type(void)
{
return "Broadcom BCM47XX";
}
-void prom_putchar(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];
- }
- }
+
+ cfe_eptseal = (uint32_t) fw_arg3;
+ cfe_handle = (uint32_t) fw_arg0;
+ cfe_ept = (uint32_t) fw_arg2;
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) ;
+ return -1;
}
cfe_init(cfe_handle, cfe_ept);
-}
-
-static __init void prom_init_console(void)
-{
- /* Initialize CFE console */
- cfe_cons_handle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
-}
-
-static __init void prom_init_cmdline(void)
-{
- static char buf[COMMAND_LINE_SIZE] __initdata;
-
- /* Get the kernel command line from CFE */
- if (cfe_getenv("LINUX_CMDLINE", buf, COMMAND_LINE_SIZE) >= 0) {
- buf[COMMAND_LINE_SIZE - 1] = 0;
- strcpy(arcs_cmdline, buf);
- }
-
- /* Force a console handover by adding a console= argument if needed,
- * as CFE is not available anymore later in the boot process. */
- if ((strstr(arcs_cmdline, "console=")) == NULL) {
- /* Try to read the default serial port used by CFE */
- if ((cfe_getenv("BOOT_CONSOLE", buf, COMMAND_LINE_SIZE) < 0)
- || (strncmp("uart", buf, 4)))
- /* Default to uart0 */
- strcpy(buf, "uart0");
-
- /* Compute the new command line */
- snprintf(arcs_cmdline, COMMAND_LINE_SIZE, "%s console=ttyS%c,115200",
- arcs_cmdline, buf[4]);
- }
+ return 0;
}
static __init void prom_init_mem(void)
@@ -161,8 +93,6 @@ static __init void prom_init_mem(void)
void __init prom_init(void)
{
prom_init_cfe();
- prom_init_console();
- prom_init_cmdline();
prom_init_mem();
}
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