2 * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family
3 * of PCI-SCSI IO processors.
5 * Copyright (C) 1999-2001 Gerard Roudier <groudier@free.fr>
7 * This driver is derived from the Linux sym53c8xx driver.
8 * Copyright (C) 1998-2000 Gerard Roudier
10 * The sym53c8xx driver is derived from the ncr53c8xx driver that had been
11 * a port of the FreeBSD ncr driver to Linux-1.2.13.
13 * The original ncr driver has been written for 386bsd and FreeBSD by
14 * Wolfgang Stanglmeier <wolf@cologne.de>
15 * Stefan Esser <se@mi.Uni-Koeln.de>
16 * Copyright (C) 1994 Wolfgang Stanglmeier
18 * Other major contributions:
20 * NVRAM detection and reading.
21 * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
23 *-----------------------------------------------------------------------------
25 * This program is free software; you can redistribute it and/or modify
26 * it under the terms of the GNU General Public License as published by
27 * the Free Software Foundation; either version 2 of the License, or
28 * (at your option) any later version.
30 * This program is distributed in the hope that it will be useful,
31 * but WITHOUT ANY WARRANTY; without even the implied warranty of
32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
33 * GNU General Public License for more details.
35 * You should have received a copy of the GNU General Public License
36 * along with this program; if not, write to the Free Software
37 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
41 #include "sym_nvram.h"
43 #ifdef SYM_CONF_DEBUG_NVRAM
44 static u_char Tekram_boot_delay[7] = {3, 5, 10, 20, 30, 60, 120};
48 * Get host setup from NVRAM.
50 void sym_nvram_setup_host(struct Scsi_Host *shost, struct sym_hcb *np, struct sym_nvram *nvram)
53 * Get parity checking, host ID, verbose mode
54 * and miscellaneous host flags from NVRAM.
56 switch (nvram->type) {
57 case SYM_SYMBIOS_NVRAM:
58 if (!(nvram->data.Symbios.flags & SYMBIOS_PARITY_ENABLE))
59 np->rv_scntl0 &= ~0x0a;
60 np->myaddr = nvram->data.Symbios.host_id & 0x0f;
61 if (nvram->data.Symbios.flags & SYMBIOS_VERBOSE_MSGS)
63 if (nvram->data.Symbios.flags1 & SYMBIOS_SCAN_HI_LO)
64 shost->reverse_ordering = 1;
65 if (nvram->data.Symbios.flags2 & SYMBIOS_AVOID_BUS_RESET)
66 np->usrflags |= SYM_AVOID_BUS_RESET;
68 case SYM_TEKRAM_NVRAM:
69 np->myaddr = nvram->data.Tekram.host_id & 0x0f;
73 if (nvram->data.parisc.host_id != -1)
74 np->myaddr = nvram->data.parisc.host_id;
75 if (nvram->data.parisc.factor != -1)
76 np->minsync = nvram->data.parisc.factor;
77 if (nvram->data.parisc.width != -1)
78 np->maxwide = nvram->data.parisc.width;
79 switch (nvram->data.parisc.mode) {
80 case 0: np->scsi_mode = SMODE_SE; break;
81 case 1: np->scsi_mode = SMODE_HVD; break;
82 case 2: np->scsi_mode = SMODE_LVD; break;
92 * Get target set-up from Symbios format NVRAM.
95 sym_Symbios_setup_target(struct sym_hcb *np, int target, Symbios_nvram *nvram)
97 struct sym_tcb *tp = &np->target[target];
98 Symbios_target *tn = &nvram->target[target];
101 (tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED)? SYM_SETUP_MAX_TAG : 0;
103 if (!(tn->flags & SYMBIOS_DISCONNECT_ENABLE))
104 tp->usrflags &= ~SYM_DISC_ENABLED;
105 if (!(tn->flags & SYMBIOS_SCAN_AT_BOOT_TIME))
106 tp->usrflags |= SYM_SCAN_BOOT_DISABLED;
107 if (!(tn->flags & SYMBIOS_SCAN_LUNS))
108 tp->usrflags |= SYM_SCAN_LUNS_DISABLED;
112 * Get target set-up from Tekram format NVRAM.
115 sym_Tekram_setup_target(struct sym_hcb *np, int target, Tekram_nvram *nvram)
117 struct sym_tcb *tp = &np->target[target];
118 struct Tekram_target *tn = &nvram->target[target];
120 if (tn->flags & TEKRAM_TAGGED_COMMANDS) {
121 tp->usrtags = 2 << nvram->max_tags_index;
124 if (tn->flags & TEKRAM_DISCONNECT_ENABLE)
125 tp->usrflags |= SYM_DISC_ENABLED;
127 /* If any device does not support parity, we will not use this option */
128 if (!(tn->flags & TEKRAM_PARITY_CHECK))
129 np->rv_scntl0 &= ~0x0a; /* SCSI parity checking disabled */
133 * Get target setup from NVRAM.
135 void sym_nvram_setup_target(struct sym_hcb *np, int target, struct sym_nvram *nvp)
138 case SYM_SYMBIOS_NVRAM:
139 sym_Symbios_setup_target(np, target, &nvp->data.Symbios);
141 case SYM_TEKRAM_NVRAM:
142 sym_Tekram_setup_target(np, target, &nvp->data.Tekram);
149 #ifdef SYM_CONF_DEBUG_NVRAM
151 * Dump Symbios format NVRAM for debugging purpose.
153 static void sym_display_Symbios_nvram(struct sym_device *np, Symbios_nvram *nvram)
157 /* display Symbios nvram host data */
158 printf("%s: HOST ID=%d%s%s%s%s%s%s\n",
159 sym_name(np), nvram->host_id & 0x0f,
160 (nvram->flags & SYMBIOS_SCAM_ENABLE) ? " SCAM" :"",
161 (nvram->flags & SYMBIOS_PARITY_ENABLE) ? " PARITY" :"",
162 (nvram->flags & SYMBIOS_VERBOSE_MSGS) ? " VERBOSE" :"",
163 (nvram->flags & SYMBIOS_CHS_MAPPING) ? " CHS_ALT" :"",
164 (nvram->flags2 & SYMBIOS_AVOID_BUS_RESET)?" NO_RESET" :"",
165 (nvram->flags1 & SYMBIOS_SCAN_HI_LO) ? " HI_LO" :"");
167 /* display Symbios nvram drive data */
168 for (i = 0 ; i < 15 ; i++) {
169 struct Symbios_target *tn = &nvram->target[i];
170 printf("%s-%d:%s%s%s%s WIDTH=%d SYNC=%d TMO=%d\n",
172 (tn->flags & SYMBIOS_DISCONNECT_ENABLE) ? " DISC" : "",
173 (tn->flags & SYMBIOS_SCAN_AT_BOOT_TIME) ? " SCAN_BOOT" : "",
174 (tn->flags & SYMBIOS_SCAN_LUNS) ? " SCAN_LUNS" : "",
175 (tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED)? " TCQ" : "",
183 * Dump TEKRAM format NVRAM for debugging purpose.
185 static void sym_display_Tekram_nvram(struct sym_device *np, Tekram_nvram *nvram)
187 int i, tags, boot_delay;
190 /* display Tekram nvram host data */
191 tags = 2 << nvram->max_tags_index;
193 if (nvram->boot_delay_index < 6)
194 boot_delay = Tekram_boot_delay[nvram->boot_delay_index];
195 switch ((nvram->flags & TEKRAM_REMOVABLE_FLAGS) >> 6) {
197 case 0: rem = ""; break;
198 case 1: rem = " REMOVABLE=boot device"; break;
199 case 2: rem = " REMOVABLE=all"; break;
202 printf("%s: HOST ID=%d%s%s%s%s%s%s%s%s%s BOOT DELAY=%d tags=%d\n",
203 sym_name(np), nvram->host_id & 0x0f,
204 (nvram->flags1 & SYMBIOS_SCAM_ENABLE) ? " SCAM" :"",
205 (nvram->flags & TEKRAM_MORE_THAN_2_DRIVES) ? " >2DRIVES":"",
206 (nvram->flags & TEKRAM_DRIVES_SUP_1GB) ? " >1GB" :"",
207 (nvram->flags & TEKRAM_RESET_ON_POWER_ON) ? " RESET" :"",
208 (nvram->flags & TEKRAM_ACTIVE_NEGATION) ? " ACT_NEG" :"",
209 (nvram->flags & TEKRAM_IMMEDIATE_SEEK) ? " IMM_SEEK" :"",
210 (nvram->flags & TEKRAM_SCAN_LUNS) ? " SCAN_LUNS" :"",
211 (nvram->flags1 & TEKRAM_F2_F6_ENABLED) ? " F2_F6" :"",
212 rem, boot_delay, tags);
214 /* display Tekram nvram drive data */
215 for (i = 0; i <= 15; i++) {
217 struct Tekram_target *tn = &nvram->target[i];
218 j = tn->sync_index & 0xf;
219 sync = Tekram_sync[j];
220 printf("%s-%d:%s%s%s%s%s%s PERIOD=%d\n",
222 (tn->flags & TEKRAM_PARITY_CHECK) ? " PARITY" : "",
223 (tn->flags & TEKRAM_SYNC_NEGO) ? " SYNC" : "",
224 (tn->flags & TEKRAM_DISCONNECT_ENABLE) ? " DISC" : "",
225 (tn->flags & TEKRAM_START_CMD) ? " START" : "",
226 (tn->flags & TEKRAM_TAGGED_COMMANDS) ? " TCQ" : "",
227 (tn->flags & TEKRAM_WIDE_NEGO) ? " WIDE" : "",
232 static void sym_display_Symbios_nvram(struct sym_device *np, Symbios_nvram *nvram) { (void)np; (void)nvram; }
233 static void sym_display_Tekram_nvram(struct sym_device *np, Tekram_nvram *nvram) { (void)np; (void)nvram; }
234 #endif /* SYM_CONF_DEBUG_NVRAM */
238 * 24C16 EEPROM reading.
240 * GPOI0 - data in/data out
242 * Symbios NVRAM wiring now also used by Tekram.
251 * Set/clear data/clock bit in GPIO0
253 static void S24C16_set_bit(struct sym_device *np, u_char write_bit, u_char *gpreg,
272 OUTB(np, nc_gpreg, *gpreg);
278 * Send START condition to NVRAM to wake it up.
280 static void S24C16_start(struct sym_device *np, u_char *gpreg)
282 S24C16_set_bit(np, 1, gpreg, SET_BIT);
283 S24C16_set_bit(np, 0, gpreg, SET_CLK);
284 S24C16_set_bit(np, 0, gpreg, CLR_BIT);
285 S24C16_set_bit(np, 0, gpreg, CLR_CLK);
289 * Send STOP condition to NVRAM - puts NVRAM to sleep... ZZzzzz!!
291 static void S24C16_stop(struct sym_device *np, u_char *gpreg)
293 S24C16_set_bit(np, 0, gpreg, SET_CLK);
294 S24C16_set_bit(np, 1, gpreg, SET_BIT);
298 * Read or write a bit to the NVRAM,
299 * read if GPIO0 input else write if GPIO0 output
301 static void S24C16_do_bit(struct sym_device *np, u_char *read_bit, u_char write_bit,
304 S24C16_set_bit(np, write_bit, gpreg, SET_BIT);
305 S24C16_set_bit(np, 0, gpreg, SET_CLK);
307 *read_bit = INB(np, nc_gpreg);
308 S24C16_set_bit(np, 0, gpreg, CLR_CLK);
309 S24C16_set_bit(np, 0, gpreg, CLR_BIT);
313 * Output an ACK to the NVRAM after reading,
314 * change GPIO0 to output and when done back to an input
316 static void S24C16_write_ack(struct sym_device *np, u_char write_bit, u_char *gpreg,
319 OUTB(np, nc_gpcntl, *gpcntl & 0xfe);
320 S24C16_do_bit(np, NULL, write_bit, gpreg);
321 OUTB(np, nc_gpcntl, *gpcntl);
325 * Input an ACK from NVRAM after writing,
326 * change GPIO0 to input and when done back to an output
328 static void S24C16_read_ack(struct sym_device *np, u_char *read_bit, u_char *gpreg,
331 OUTB(np, nc_gpcntl, *gpcntl | 0x01);
332 S24C16_do_bit(np, read_bit, 1, gpreg);
333 OUTB(np, nc_gpcntl, *gpcntl);
337 * WRITE a byte to the NVRAM and then get an ACK to see it was accepted OK,
338 * GPIO0 must already be set as an output
340 static void S24C16_write_byte(struct sym_device *np, u_char *ack_data, u_char write_data,
341 u_char *gpreg, u_char *gpcntl)
345 for (x = 0; x < 8; x++)
346 S24C16_do_bit(np, NULL, (write_data >> (7 - x)) & 0x01, gpreg);
348 S24C16_read_ack(np, ack_data, gpreg, gpcntl);
352 * READ a byte from the NVRAM and then send an ACK to say we have got it,
353 * GPIO0 must already be set as an input
355 static void S24C16_read_byte(struct sym_device *np, u_char *read_data, u_char ack_data,
356 u_char *gpreg, u_char *gpcntl)
362 for (x = 0; x < 8; x++) {
363 S24C16_do_bit(np, &read_bit, 1, gpreg);
364 *read_data |= ((read_bit & 0x01) << (7 - x));
367 S24C16_write_ack(np, ack_data, gpreg, gpcntl);
370 #ifdef SYM_CONF_NVRAM_WRITE_SUPPORT
372 * Write 'len' bytes starting at 'offset'.
374 static int sym_write_S24C16_nvram(struct sym_device *np, int offset,
375 u_char *data, int len)
377 u_char gpcntl, gpreg;
378 u_char old_gpcntl, old_gpreg;
382 /* save current state of GPCNTL and GPREG */
383 old_gpreg = INB(np, nc_gpreg);
384 old_gpcntl = INB(np, nc_gpcntl);
385 gpcntl = old_gpcntl & 0x1c;
387 /* set up GPREG & GPCNTL to set GPIO0 and GPIO1 in to known state */
388 OUTB(np, nc_gpreg, old_gpreg);
389 OUTB(np, nc_gpcntl, gpcntl);
391 /* this is to set NVRAM into a known state with GPIO0/1 both low */
393 S24C16_set_bit(np, 0, &gpreg, CLR_CLK);
394 S24C16_set_bit(np, 0, &gpreg, CLR_BIT);
396 /* now set NVRAM inactive with GPIO0/1 both high */
397 S24C16_stop(np, &gpreg);
399 /* NVRAM has to be written in segments of 16 bytes */
400 for (x = 0; x < len ; x += 16) {
402 S24C16_start(np, &gpreg);
403 S24C16_write_byte(np, &ack_data,
404 0xa0 | (((offset+x) >> 7) & 0x0e),
406 } while (ack_data & 0x01);
408 S24C16_write_byte(np, &ack_data, (offset+x) & 0xff,
411 for (y = 0; y < 16; y++)
412 S24C16_write_byte(np, &ack_data, data[x+y],
414 S24C16_stop(np, &gpreg);
417 /* return GPIO0/1 to original states after having accessed NVRAM */
418 OUTB(np, nc_gpcntl, old_gpcntl);
419 OUTB(np, nc_gpreg, old_gpreg);
423 #endif /* SYM_CONF_NVRAM_WRITE_SUPPORT */
426 * Read 'len' bytes starting at 'offset'.
428 static int sym_read_S24C16_nvram(struct sym_device *np, int offset, u_char *data, int len)
430 u_char gpcntl, gpreg;
431 u_char old_gpcntl, old_gpreg;
436 /* save current state of GPCNTL and GPREG */
437 old_gpreg = INB(np, nc_gpreg);
438 old_gpcntl = INB(np, nc_gpcntl);
439 gpcntl = old_gpcntl & 0x1c;
441 /* set up GPREG & GPCNTL to set GPIO0 and GPIO1 in to known state */
442 OUTB(np, nc_gpreg, old_gpreg);
443 OUTB(np, nc_gpcntl, gpcntl);
445 /* this is to set NVRAM into a known state with GPIO0/1 both low */
447 S24C16_set_bit(np, 0, &gpreg, CLR_CLK);
448 S24C16_set_bit(np, 0, &gpreg, CLR_BIT);
450 /* now set NVRAM inactive with GPIO0/1 both high */
451 S24C16_stop(np, &gpreg);
454 S24C16_start(np, &gpreg);
456 /* write device code and random address MSB */
457 S24C16_write_byte(np, &ack_data,
458 0xa0 | ((offset >> 7) & 0x0e), &gpreg, &gpcntl);
462 /* write random address LSB */
463 S24C16_write_byte(np, &ack_data,
464 offset & 0xff, &gpreg, &gpcntl);
468 /* regenerate START state to set up for reading */
469 S24C16_start(np, &gpreg);
471 /* rewrite device code and address MSB with read bit set (lsb = 0x01) */
472 S24C16_write_byte(np, &ack_data,
473 0xa1 | ((offset >> 7) & 0x0e), &gpreg, &gpcntl);
477 /* now set up GPIO0 for inputting data */
479 OUTB(np, nc_gpcntl, gpcntl);
481 /* input all requested data - only part of total NVRAM */
482 for (x = 0; x < len; x++)
483 S24C16_read_byte(np, &data[x], (x == (len-1)), &gpreg, &gpcntl);
485 /* finally put NVRAM back in inactive mode */
487 OUTB(np, nc_gpcntl, gpcntl);
488 S24C16_stop(np, &gpreg);
491 /* return GPIO0/1 to original states after having accessed NVRAM */
492 OUTB(np, nc_gpcntl, old_gpcntl);
493 OUTB(np, nc_gpreg, old_gpreg);
504 * Try reading Symbios NVRAM.
507 static int sym_read_Symbios_nvram(struct sym_device *np, Symbios_nvram *nvram)
509 static u_char Symbios_trailer[6] = {0xfe, 0xfe, 0, 0, 0, 0};
510 u_char *data = (u_char *) nvram;
511 int len = sizeof(*nvram);
515 /* probe the 24c16 and read the SYMBIOS 24c16 area */
516 if (sym_read_S24C16_nvram (np, SYMBIOS_NVRAM_ADDRESS, data, len))
519 /* check valid NVRAM signature, verify byte count and checksum */
520 if (nvram->type != 0 ||
521 memcmp(nvram->trailer, Symbios_trailer, 6) ||
522 nvram->byte_count != len - 12)
525 /* verify checksum */
526 for (x = 6, csum = 0; x < len - 6; x++)
528 if (csum != nvram->checksum)
535 * 93C46 EEPROM reading.
540 * GPIO4 - chip select
546 * Pulse clock bit in GPIO0
548 static void T93C46_Clk(struct sym_device *np, u_char *gpreg)
550 OUTB(np, nc_gpreg, *gpreg | 0x04);
553 OUTB(np, nc_gpreg, *gpreg);
557 * Read bit from NVRAM
559 static void T93C46_Read_Bit(struct sym_device *np, u_char *read_bit, u_char *gpreg)
562 T93C46_Clk(np, gpreg);
563 *read_bit = INB(np, nc_gpreg);
569 static void T93C46_Write_Bit(struct sym_device *np, u_char write_bit, u_char *gpreg)
571 if (write_bit & 0x01)
578 OUTB(np, nc_gpreg, *gpreg);
582 T93C46_Clk(np, gpreg);
586 * Send STOP condition to NVRAM - puts NVRAM to sleep... ZZZzzz!!
588 static void T93C46_Stop(struct sym_device *np, u_char *gpreg)
591 OUTB(np, nc_gpreg, *gpreg);
595 T93C46_Clk(np, gpreg);
599 * Send read command and address to NVRAM
601 static void T93C46_Send_Command(struct sym_device *np, u_short write_data,
602 u_char *read_bit, u_char *gpreg)
606 /* send 9 bits, start bit (1), command (2), address (6) */
607 for (x = 0; x < 9; x++)
608 T93C46_Write_Bit(np, (u_char) (write_data >> (8 - x)), gpreg);
610 *read_bit = INB(np, nc_gpreg);
614 * READ 2 bytes from the NVRAM
616 static void T93C46_Read_Word(struct sym_device *np,
617 unsigned short *nvram_data, unsigned char *gpreg)
623 for (x = 0; x < 16; x++) {
624 T93C46_Read_Bit(np, &read_bit, gpreg);
627 *nvram_data |= (0x01 << (15 - x));
629 *nvram_data &= ~(0x01 << (15 - x));
634 * Read Tekram NvRAM data.
636 static int T93C46_Read_Data(struct sym_device *np, unsigned short *data,
637 int len, unsigned char *gpreg)
641 for (x = 0; x < len; x++) {
642 unsigned char read_bit;
643 /* output read command and address */
644 T93C46_Send_Command(np, 0x180 | x, &read_bit, gpreg);
647 T93C46_Read_Word(np, &data[x], gpreg);
648 T93C46_Stop(np, gpreg);
655 * Try reading 93C46 Tekram NVRAM.
657 static int sym_read_T93C46_nvram(struct sym_device *np, Tekram_nvram *nvram)
659 u_char gpcntl, gpreg;
660 u_char old_gpcntl, old_gpreg;
663 /* save current state of GPCNTL and GPREG */
664 old_gpreg = INB(np, nc_gpreg);
665 old_gpcntl = INB(np, nc_gpcntl);
667 /* set up GPREG & GPCNTL to set GPIO0/1/2/4 in to known state, 0 in,
669 gpreg = old_gpreg & 0xe9;
670 OUTB(np, nc_gpreg, gpreg);
671 gpcntl = (old_gpcntl & 0xe9) | 0x09;
672 OUTB(np, nc_gpcntl, gpcntl);
674 /* input all of NVRAM, 64 words */
675 retv = T93C46_Read_Data(np, (u_short *) nvram,
676 sizeof(*nvram) / sizeof(short), &gpreg);
678 /* return GPIO0/1/2/4 to original states after having accessed NVRAM */
679 OUTB(np, nc_gpcntl, old_gpcntl);
680 OUTB(np, nc_gpreg, old_gpreg);
686 * Try reading Tekram NVRAM.
689 static int sym_read_Tekram_nvram (struct sym_device *np, Tekram_nvram *nvram)
691 u_char *data = (u_char *) nvram;
692 int len = sizeof(*nvram);
696 switch (np->device_id) {
697 case PCI_DEVICE_ID_NCR_53C885:
698 case PCI_DEVICE_ID_NCR_53C895:
699 case PCI_DEVICE_ID_NCR_53C896:
700 x = sym_read_S24C16_nvram(np, TEKRAM_24C16_NVRAM_ADDRESS,
703 case PCI_DEVICE_ID_NCR_53C875:
704 x = sym_read_S24C16_nvram(np, TEKRAM_24C16_NVRAM_ADDRESS,
709 x = sym_read_T93C46_nvram(np, nvram);
715 /* verify checksum */
716 for (x = 0, csum = 0; x < len - 1; x += 2)
717 csum += data[x] + (data[x+1] << 8);
726 * Host firmware (PDC) keeps a table for altering SCSI capabilities.
727 * Many newer machines export one channel of 53c896 chip as SE, 50-pin HD.
728 * Also used for Multi-initiator SCSI clusters to set the SCSI Initiator ID.
730 static int sym_read_parisc_pdc(struct sym_device *np, struct pdc_initiator *pdc)
732 struct hardware_path hwpath;
733 get_pci_node_path(np->pdev, &hwpath);
734 if (!pdc_get_initiator(&hwpath, pdc))
737 return SYM_PARISC_PDC;
740 static inline int sym_read_parisc_pdc(struct sym_device *np,
741 struct pdc_initiator *x)
748 * Try reading Symbios or Tekram NVRAM
750 int sym_read_nvram(struct sym_device *np, struct sym_nvram *nvp)
752 if (!sym_read_Symbios_nvram(np, &nvp->data.Symbios)) {
753 nvp->type = SYM_SYMBIOS_NVRAM;
754 sym_display_Symbios_nvram(np, &nvp->data.Symbios);
755 } else if (!sym_read_Tekram_nvram(np, &nvp->data.Tekram)) {
756 nvp->type = SYM_TEKRAM_NVRAM;
757 sym_display_Tekram_nvram(np, &nvp->data.Tekram);
759 nvp->type = sym_read_parisc_pdc(np, &nvp->data.parisc);
764 char *sym_nvram_type(struct sym_nvram *nvp)
767 case SYM_SYMBIOS_NVRAM:
768 return "Symbios NVRAM";
769 case SYM_TEKRAM_NVRAM:
770 return "Tekram NVRAM";
772 return "PA-RISC Firmware";