# --------------------------------------------
# 03/09/21 [email protected] 1.1354
# [PNPBIOS] compilation fix for pnpbios without proc support
#
# Here's an updated patch that will correct the compile error when PROC
# FS is disabled. It also introduces better proc error recovery and
# moves the local proc functions to the local include file. Thanks to
# Daniele Bellucci for finding the problem and contributing to this
# patch.
#
# --------------------------------------------
#
diff -Nru a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c
--- a/drivers/pnp/pnpbios/core.c Sun Sep 21 19:46:16 2003
+++ b/drivers/pnp/pnpbios/core.c Sun Sep 21 19:46:16 2003
@@ -431,14 +431,15 @@
}
/* register with the pnp layer */
- pnp_register_protocol(&pnpbios_protocol);
+ if (pnp_register_protocol(&pnpbios_protocol)) {
+ printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n");
+ return -EIO;
+ }
-#ifdef CONFIG_PROC_FS
/* start the proc interface */
ret = pnpbios_proc_init();
if (ret)
- return ret;
-#endif
+ printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
/* scan for pnpbios devices */
build_devlist();
diff -Nru a/drivers/pnp/pnpbios/pnpbios.h b/drivers/pnp/pnpbios/pnpbios.h
--- a/drivers/pnp/pnpbios/pnpbios.h Sun Sep 21 19:46:16 2003
+++ b/drivers/pnp/pnpbios/pnpbios.h Sun Sep 21 19:46:16 2003
@@ -9,3 +9,13 @@
extern void pnpbios_print_status(const char * module, u16 status);
extern int pnpbios_probe_installation(void);
+
+#ifdef CONFIG_PROC_FS
+extern int pnpbios_interface_attach_device(struct pnp_bios_node * node);
+extern int pnpbios_proc_init (void);
+extern void pnpbios_proc_exit (void);
+#else
+static inline int pnpbios_interface_attach_device(struct pnp_bios_node * node) { return 0; }
+static inline int pnpbios_proc_init (void) { return 0; }
+static inline void pnpbios_proc_exit (void) { ; }
+#endif /* CONFIG_PROC */
diff -Nru a/drivers/pnp/pnpbios/proc.c b/drivers/pnp/pnpbios/proc.c
--- a/drivers/pnp/pnpbios/proc.c Sun Sep 21 19:46:16 2003
+++ b/drivers/pnp/pnpbios/proc.c Sun Sep 21 19:46:16 2003
@@ -31,6 +31,8 @@
#include <asm/uaccess.h>
+#include "pnpbios.h"
+
static struct proc_dir_entry *proc_pnp = NULL;
static struct proc_dir_entry *proc_pnp_boot = NULL;
@@ -213,6 +215,9 @@
struct proc_dir_entry *ent;
sprintf(name, "%02x", node->handle);
+
+ if (!proc_pnp)
+ return -EIO;
if ( !pnpbios_dont_use_current_config ) {
ent = create_proc_entry(name, 0, proc_pnp);
if (ent) {
@@ -221,6 +226,9 @@
ent->data = (void *)(long)(node->handle);
}
}
+
+ if (!proc_pnp_boot)
+ return -EIO;
ent = create_proc_entry(name, 0, proc_pnp_boot);
if (ent) {
ent->read_proc = proc_read_node;
@@ -228,6 +236,7 @@
ent->data = (void *)(long)(node->handle+0x100);
return 0;
}
+
return -EIO;
}
@@ -257,8 +266,9 @@
{
int i;
char name[3];
-
- if (!proc_pnp) return;
+
+ if (!proc_pnp)
+ return;
for (i=0; i<0xff; i++) {
sprintf(name, "%02x", i);
diff -Nru a/include/linux/pnpbios.h b/include/linux/pnpbios.h
--- a/include/linux/pnpbios.h Sun Sep 21 19:46:16 2003
+++ b/include/linux/pnpbios.h Sun Sep 21 19:46:16 2003
@@ -26,7 +26,7 @@
#ifdef __KERNEL__
#include <linux/types.h>
-#include <linux/pci.h>
+#include <linux/pnp.h>
/*
* Return codes
@@ -135,9 +135,6 @@
extern struct pnp_dev_node_info node_info;
extern void *pnpbios_kmalloc(size_t size, int f);
extern int pnpbios_init (void);
-extern int pnpbios_interface_attach_device(struct pnp_bios_node * node);
-extern int pnpbios_proc_init (void);
-extern void pnpbios_proc_exit (void);
extern int pnp_bios_dev_node_info (struct pnp_dev_node_info *data);
extern int pnp_bios_get_dev_node (u8 *nodenum, char config, struct pnp_bios_node *data);
# --------------------------------------------
# 03/09/21 [email protected] 1.1356
# [PNPBIOS] move detection code into core.c
#
# This patch moves the detection code to a more appropriate file.
# --------------------------------------------
#
diff -Nru a/drivers/pnp/pnpbios/bioscalls.c b/drivers/pnp/pnpbios/bioscalls.c
--- a/drivers/pnp/pnpbios/bioscalls.c Sun Sep 21 19:46:04 2003
+++ b/drivers/pnp/pnpbios/bioscalls.c Sun Sep 21 19:46:04 2003
@@ -23,41 +23,7 @@
#include <asm/system.h>
#include <asm/byteorder.h>
-
-/* PnP BIOS signature: "$PnP" */
-#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
-
-#pragma pack(1)
-union pnp_bios_expansion_header {
- struct {
- u32 signature; /* "$PnP" */
- u8 version; /* in BCD */
- u8 length; /* length in bytes, currently 21h */
- u16 control; /* system capabilities */
- u8 checksum; /* all bytes must add up to 0 */
-
- u32 eventflag; /* phys. address of the event flag */
- u16 rmoffset; /* real mode entry point */
- u16 rmcseg;
- u16 pm16offset; /* 16 bit protected mode entry */
- u32 pm16cseg;
- u32 deviceID; /* EISA encoded system ID or 0 */
- u16 rmdseg; /* real mode data segment */
- u32 pm16dseg; /* 16 bit pm data segment base */
- } fields;
- char chars[0x21]; /* To calculate the checksum */
-};
-#pragma pack()
-
-static union pnp_bios_expansion_header * pnp_bios_hdr = NULL;
-
-/*
- * Call this only after init time
- */
-static int pnp_bios_present(void)
-{
- return (pnp_bios_hdr != NULL);
-}
+#include "pnpbios.h"
static struct {
u16 offset;
@@ -557,10 +523,10 @@
/*
- * Probing and Initialization
+ * Initialization
*/
-static void pnpbios_prepare_bios_calls(union pnp_bios_expansion_header *header)
+void pnpbios_calls_init(union pnp_bios_install_struct *header)
{
int i;
spin_lock_init(&pnp_bios_lock);
@@ -575,53 +541,4 @@
Q_SET_SEL(i, PNP_CS16, header->fields.pm16cseg, 64 * 1024);
Q_SET_SEL(i, PNP_DS, header->fields.pm16dseg, 64 * 1024);
}
-}
-
-int pnpbios_probe_installation(void)
-{
- union pnp_bios_expansion_header *check;
- u8 sum;
- int length, i;
-
- printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
-
- /*
- * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
- * structure and, if one is found, sets up the selectors and
- * entry points
- */
- for (check = (union pnp_bios_expansion_header *) __va(0xf0000);
- check < (union pnp_bios_expansion_header *) __va(0xffff0);
- ((void *) (check)) += 16) {
- if (check->fields.signature != PNP_SIGNATURE)
- continue;
- printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check);
- length = check->fields.length;
- if (!length) {
- printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n");
- continue;
- }
- for (sum = 0, i = 0; i < length; i++)
- sum += check->chars[i];
- if (sum) {
- printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n");
- continue;
- }
- if (check->fields.version < 0x10) {
- printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
- check->fields.version >> 4,
- check->fields.version & 15);
- continue;
- }
- printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
- check->fields.version >> 4, check->fields.version & 15,
- check->fields.pm16cseg, check->fields.pm16offset,
- check->fields.pm16dseg);
- pnp_bios_hdr = check;
- pnpbios_prepare_bios_calls(check);
- return 1;
- }
-
- printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
- return 0;
}
diff -Nru a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c
--- a/drivers/pnp/pnpbios/core.c Sun Sep 21 19:46:04 2003
+++ b/drivers/pnp/pnpbios/core.c Sun Sep 21 19:46:04 2003
@@ -74,6 +74,13 @@
*
*/
+static union pnp_bios_install_struct * pnp_bios_install = NULL;
+
+int pnp_bios_present(void)
+{
+ return (pnp_bios_install != NULL);
+}
+
struct pnp_dev_node_info node_info;
void *pnpbios_kmalloc(size_t size, int f)
@@ -410,7 +417,56 @@
__setup("pnpbios=", pnpbios_setup);
#endif
-subsys_initcall(pnpbios_init);
+/* PnP BIOS signature: "$PnP" */
+#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
+
+int __init pnpbios_probe_system(void)
+{
+ union pnp_bios_install_struct *check;
+ u8 sum;
+ int length, i;
+
+ printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
+
+ /*
+ * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
+ * structure and, if one is found, sets up the selectors and
+ * entry points
+ */
+ for (check = (union pnp_bios_install_struct *) __va(0xf0000);
+ check < (union pnp_bios_install_struct *) __va(0xffff0);
+ ((void *) (check)) += 16) {
+ if (check->fields.signature != PNP_SIGNATURE)
+ continue;
+ printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check);
+ length = check->fields.length;
+ if (!length) {
+ printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n");
+ continue;
+ }
+ for (sum = 0, i = 0; i < length; i++)
+ sum += check->chars[i];
+ if (sum) {
+ printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n");
+ continue;
+ }
+ if (check->fields.version < 0x10) {
+ printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
+ check->fields.version >> 4,
+ check->fields.version & 15);
+ continue;
+ }
+ printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
+ check->fields.version >> 4, check->fields.version & 15,
+ check->fields.pm16cseg, check->fields.pm16offset,
+ check->fields.pm16dseg);
+ pnp_bios_install = check;
+ return 1;
+ }
+
+ printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
+ return 0;
+}
int __init pnpbios_init(void)
{
@@ -421,9 +477,12 @@
}
/* scan the system for pnpbios support */
- if (!pnpbios_probe_installation())
+ if (!pnpbios_probe_system())
return -ENODEV;
+ /* make preparations for bios calls */
+ pnpbios_calls_init(pnp_bios_install);
+
/* read the node info */
if (pnp_bios_dev_node_info(&node_info)) {
printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n");
@@ -446,6 +505,8 @@
return 0;
}
+
+subsys_initcall(pnpbios_init);
static int __init pnpbios_thread_init(void)
{
diff -Nru a/drivers/pnp/pnpbios/pnpbios.h b/drivers/pnp/pnpbios/pnpbios.h
--- a/drivers/pnp/pnpbios/pnpbios.h Sun Sep 21 19:46:04 2003
+++ b/drivers/pnp/pnpbios/pnpbios.h Sun Sep 21 19:46:04 2003
@@ -1,14 +1,38 @@
/*
- * pnpbios.h - contains definitions for functions used only locally.
+ * pnpbios.h - contains local definitions
*/
+#pragma pack(1)
+union pnp_bios_install_struct {
+ struct {
+ u32 signature; /* "$PnP" */
+ u8 version; /* in BCD */
+ u8 length; /* length in bytes, currently 21h */
+ u16 control; /* system capabilities */
+ u8 checksum; /* all bytes must add up to 0 */
+
+ u32 eventflag; /* phys. address of the event flag */
+ u16 rmoffset; /* real mode entry point */
+ u16 rmcseg;
+ u16 pm16offset; /* 16 bit protected mode entry */
+ u32 pm16cseg;
+ u32 deviceID; /* EISA encoded system ID or 0 */
+ u16 rmdseg; /* real mode data segment */
+ u32 pm16dseg; /* 16 bit pm data segment base */
+ } fields;
+ char chars[0x21]; /* To calculate the checksum */
+};
+#pragma pack()
+
+extern int pnp_bios_present(void);
+
extern int pnpbios_parse_data_stream(struct pnp_dev *dev, struct pnp_bios_node * node);
extern int pnpbios_read_resources_from_node(struct pnp_resource_table *res, struct pnp_bios_node * node);
extern int pnpbios_write_resources_to_node(struct pnp_resource_table *res, struct pnp_bios_node * node);
extern void pnpid32_to_pnpid(u32 id, char *str);
extern void pnpbios_print_status(const char * module, u16 status);
-extern int pnpbios_probe_installation(void);
+extern void pnpbios_calls_init(union pnp_bios_install_struct * header);
#ifdef CONFIG_PROC_FS
extern int pnpbios_interface_attach_device(struct pnp_bios_node * node);
# --------------------------------------------
# 03/09/21 [email protected] 1.1358
# [PATCH] janitor: remove unneeded includes (isapnp)
#
# From: Randy Hron <[email protected]>
# --------------------------------------------
#
diff -Nru a/drivers/pnp/isapnp/compat.c b/drivers/pnp/isapnp/compat.c
--- a/drivers/pnp/isapnp/compat.c Sun Sep 21 19:45:53 2003
+++ b/drivers/pnp/isapnp/compat.c Sun Sep 21 19:45:53 2003
@@ -9,7 +9,6 @@
/* TODO: see if more isapnp functions are needed here */
#include <linux/config.h>
-#include <linux/version.h>
#include <linux/module.h>
#include <linux/isapnp.h>
#include <linux/string.h>
diff -Nru a/drivers/pnp/isapnp/core.c b/drivers/pnp/isapnp/core.c
--- a/drivers/pnp/isapnp/core.c Sun Sep 21 19:45:53 2003
+++ b/drivers/pnp/isapnp/core.c Sun Sep 21 19:45:53 2003
@@ -35,7 +35,6 @@
*/
#include <linux/config.h>
-#include <linux/version.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
diff -Nru a/drivers/pnp/isapnp/proc.c b/drivers/pnp/isapnp/proc.c
--- a/drivers/pnp/isapnp/proc.c Sun Sep 21 19:45:53 2003
+++ b/drivers/pnp/isapnp/proc.c Sun Sep 21 19:45:53 2003
@@ -20,7 +20,6 @@
*/
#include <linux/config.h>
-#include <linux/version.h>
#include <linux/module.h>
#include <linux/isapnp.h>
#include <linux/proc_fs.h>
# --------------------------------------------
# 03/09/21 [email protected] 1.1355
# [PNP] release card devices on probe failure
#
# When a driver's probe routine fails, it may not release all of the
# card devices it requested. This patch allows the pnp layer to ensure
# that all devices claimed by the failing driver are released properly.
# --------------------------------------------
#
diff -Nru a/drivers/pnp/card.c b/drivers/pnp/card.c
--- a/drivers/pnp/card.c Sun Sep 21 19:46:10 2003
+++ b/drivers/pnp/card.c Sun Sep 21 19:46:10 2003
@@ -62,8 +62,14 @@
if (drv->probe) {
if (drv->probe(clink, id)>=0)
return 1;
- else
+ else {
+ struct pnp_dev * dev;
+ card_for_each_dev(card, dev) {
+ if (dev->card_link == clink)
+ pnp_release_card_device(dev);
+ }
kfree(clink);
+ }
} else
return 1;
}
# --------------------------------------------
# 03/09/21 [email protected] 1.1357
# [PNP] remove DMA 0 restrictions
#
# The original argument for blocking DMA 0 was to avoid conflicts with
# "memory refresh" but such configurations are only found on very old
# 8-bit systems that are likely not supported by the linux kernel.
# This patch allows dma 0 to be assigned to PnP devices by default. If
# for whatever reason dma 0 cannot be used, one can avoid allocating it
# by setting the pnp_reserve_dma= kernel parameter.
# --------------------------------------------
#
diff -Nru a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
--- a/drivers/pnp/quirks.c Sun Sep 21 19:45:59 2003
+++ b/drivers/pnp/quirks.c Sun Sep 21 19:45:59 2003
@@ -111,28 +111,6 @@
return;
}
-extern int pnp_allow_dma0;
-static void quirk_opl3sax_resources(struct pnp_dev *dev)
-{
- /* This really isn't a device quirk but isapnp core code
- * doesn't allow a DMA channel of 0, afflicted card is an
- * OPL3Sax where x=4.
- */
- struct pnp_option *res;
- int max;
- res = dev->dependent;
- max = 0;
- for (; res; res = res->next) {
- if (res->dma->map > max)
- max = res->dma->map;
- }
- if (max == 1 && pnp_allow_dma0 == -1) {
- printk(KERN_INFO "pnp: opl3sa4 quirk: Allowing dma 0.\n");
- pnp_allow_dma0 = 1;
- }
- return;
-}
-
/*
* PnP Quirks
* Cards or devices that need some tweaking due to incomplete resource info
@@ -153,7 +131,6 @@
{ "CTL0043", quirk_sb16audio_resources },
{ "CTL0044", quirk_sb16audio_resources },
{ "CTL0045", quirk_sb16audio_resources },
- { "YMH0021", quirk_opl3sax_resources },
{ "" }
};
@@ -170,4 +147,3 @@
i++;
}
}
-
diff -Nru a/drivers/pnp/resource.c b/drivers/pnp/resource.c
--- a/drivers/pnp/resource.c Sun Sep 21 19:45:59 2003
+++ b/drivers/pnp/resource.c Sun Sep 21 19:45:59 2003
@@ -21,8 +21,6 @@
#include <linux/pnp.h>
#include "base.h"
-int pnp_allow_dma0 = -1; /* allow dma 0 during auto activation:
- * -1=off (:default), 0=off (set by user), 1=on */
int pnp_skip_pci_scan; /* skip PCI resource scanning */
int pnp_reserve_irq[16] = { [0 ... 15] = -1 }; /* reserve (don't use) some IRQ */
int pnp_reserve_dma[8] = { [0 ... 7] = -1 }; /* reserve (don't use) some DMA */
@@ -426,7 +424,7 @@
int pnp_check_dma(struct pnp_dev * dev, int idx)
{
- int tmp, mindma = 1;
+ int tmp;
struct pnp_dev *tdev;
unsigned long * dma = &dev->res.dma_resource[idx].start;
@@ -435,9 +433,7 @@
return 1;
/* check if the resource is valid */
- if (pnp_allow_dma0 == 1)
- mindma = 0;
- if (*dma < mindma || *dma == 4 || *dma > 7)
+ if (*dma < 0 || *dma == 4 || *dma > 7)
return 0;
/* check if the resource is reserved */
@@ -487,16 +483,6 @@
EXPORT_SYMBOL(pnp_register_port_resource);
EXPORT_SYMBOL(pnp_register_mem_resource);
-
-/* format is: allowdma0 */
-
-static int __init pnp_allowdma0(char *str)
-{
- pnp_allow_dma0 = 1;
- return 1;
-}
-
-__setup("allowdma0", pnp_allowdma0);
/* format is: pnp_reserve_irq=irq1[,irq2] .... */
# --------------------------------------------
# 03/09/21 [email protected] 1.1359
# [ISAPNP] remove unused isapnp_allow_dma0 modparam
#
# It looks like this option has been moved from isapnp to resource.c,
# but the MODULE_PARM line is still there:
#
# patch from: Gerald Teschl <[email protected]>
# --------------------------------------------
#
diff -Nru a/drivers/pnp/isapnp/core.c b/drivers/pnp/isapnp/core.c
--- a/drivers/pnp/isapnp/core.c Sun Sep 21 19:45:47 2003
+++ b/drivers/pnp/isapnp/core.c Sun Sep 21 19:45:47 2003
@@ -64,7 +64,6 @@
MODULE_PARM_DESC(isapnp_rdp, "ISA Plug & Play read data port");
MODULE_PARM(isapnp_reset, "i");
MODULE_PARM_DESC(isapnp_reset, "ISA Plug & Play reset all cards");
-MODULE_PARM(isapnp_allow_dma0, "i");
MODULE_PARM(isapnp_verbose, "i");
MODULE_PARM_DESC(isapnp_verbose, "ISA Plug & Play verbose mode");
MODULE_LICENSE("GPL");
# --------------------------------------------
# 03/09/21 [email protected] 1.1360
# [PNPBIOS] return proper error codes on init failure
# --------------------------------------------
#
diff -Nru a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c
--- a/drivers/pnp/pnpbios/core.c Sun Sep 21 19:45:42 2003
+++ b/drivers/pnp/pnpbios/core.c Sun Sep 21 19:45:42 2003
@@ -484,15 +484,17 @@
pnpbios_calls_init(pnp_bios_install);
/* read the node info */
- if (pnp_bios_dev_node_info(&node_info)) {
+ ret = pnp_bios_dev_node_info(&node_info);
+ if (ret) {
printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n");
- return -EIO;
+ return ret;
}
/* register with the pnp layer */
- if (pnp_register_protocol(&pnpbios_protocol)) {
+ ret = pnp_register_protocol(&pnpbios_protocol);
+ if (ret) {
printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n");
- return -EIO;
+ return ret;
}
/* start the proc interface */
# --------------------------------------------
# 03/09/21 [email protected] 1.1361
# [PNPBIOS] move some more functions to local include file
#
# This patch moves some unnecessary global functions to the local
# pnpbios include file.
#
# --------------------------------------------
#
diff -Nru a/drivers/pnp/pnpbios/pnpbios.h b/drivers/pnp/pnpbios/pnpbios.h
--- a/drivers/pnp/pnpbios/pnpbios.h Sun Sep 21 19:45:34 2003
+++ b/drivers/pnp/pnpbios/pnpbios.h Sun Sep 21 19:45:34 2003
@@ -25,6 +25,8 @@
#pragma pack()
extern int pnp_bios_present(void);
+extern int pnpbios_dont_use_current_config;
+extern void *pnpbios_kmalloc(size_t size, int f);
extern int pnpbios_parse_data_stream(struct pnp_dev *dev, struct pnp_bios_node * node);
extern int pnpbios_read_resources_from_node(struct pnp_resource_table *res, struct pnp_bios_node * node);
diff -Nru a/include/linux/pnpbios.h b/include/linux/pnpbios.h
--- a/include/linux/pnpbios.h Sun Sep 21 19:45:34 2003
+++ b/include/linux/pnpbios.h Sun Sep 21 19:45:34 2003
@@ -131,10 +131,7 @@
#ifdef CONFIG_PNPBIOS
/* non-exported */
-extern int pnpbios_dont_use_current_config;
extern struct pnp_dev_node_info node_info;
-extern void *pnpbios_kmalloc(size_t size, int f);
-extern int pnpbios_init (void);
extern int pnp_bios_dev_node_info (struct pnp_dev_node_info *data);
extern int pnp_bios_get_dev_node (u8 *nodenum, char config, struct pnp_bios_node *data);
On Sul, 2003-09-21 at 21:11, Adam Belay wrote:
> # --------------------------------------------
> # 03/09/21 [email protected] 1.1357
> # [PNP] remove DMA 0 restrictions
> #
> # The original argument for blocking DMA 0 was to avoid conflicts with
> # "memory refresh" but such configurations are only found on very old
> # 8-bit systems that are likely not supported by the linux kernel.
DMA0 is used by lots of 386/486 era systems for memory refresh. It is
also "borrowed" by some other systems that know it isnt available to the
OS. There are a couple of heuristics I've seen suggested by vendors of
things like sound cards
1. Check the PnPBIOS information (never looked into this myself)
2. Assume DMA 0 is free if the machine has a PCI bus detected
3. Read the DMA 0 counter a few times. If it is continually changing
don't use DMA 0
#2 is certainly a good idea IMHO, I don't know how well the others work.
On Mon, Sep 22, 2003 at 12:32:15PM +0100, Alan Cox wrote:
> On Sul, 2003-09-21 at 21:11, Adam Belay wrote:
> > # --------------------------------------------
> > # 03/09/21 [email protected] 1.1357
> > # [PNP] remove DMA 0 restrictions
> > #
> > # The original argument for blocking DMA 0 was to avoid conflicts with
> > # "memory refresh" but such configurations are only found on very old
> > # 8-bit systems that are likely not supported by the linux kernel.
>
> DMA0 is used by lots of 386/486 era systems for memory refresh. It is
> also "borrowed" by some other systems that know it isnt available to the
> OS. There are a couple of heuristics I've seen suggested by vendors of
> things like sound cards
>
> 1. Check the PnPBIOS information (never looked into this myself)
Assuming the PnPBIOS provides this information through device nodes, the
current pnp code will ensure that dma 0 is not used.
> 2. Assume DMA 0 is free if the machine has a PCI bus detected
> 3. Read the DMA 0 counter a few times. If it is continually changing
> don't use DMA 0
>
> #2 is certainly a good idea IMHO, I don't know how well the others work.
Thanks, I'll look into these further.
Regards,
Adam