PROBLEM: Bad data from GOLDSTAR GCD-R580B

Valery Kornienkov (vlk@dimavb.simbirsk.su)
Sun, 11 Apr 1999 14:55:48 +0400

[1.] Bad data from GOLDSTAR GCD-R580B
[2.] If to turn on dma (hdparm -d1 /dev/cdrom) I obtain bad data - md5sum
files error, and not obtain anyone kernel message of errors.
But if to turn off dma (hdparm -d0 /dev/cdrom) - all ok, i'm obtain
good data from device. This error to make appearance in patch-2.2.4
[3.] kernel ide-cd
[4.] 2.2.5
[7.2.]
processor : 0
vendor_id : CyrixInstead
cpu family : 6
model : 2
model name : M II 3.5x Core/Bus Clock
stepping : 8
cpu MHz : 233.033084
fdiv_bug : no
hlt_bug : no
sep_bug : no
f00f_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu de tsc msr cx8 pge cmov mmx
bogomips : 232.65

[7.3.]
isofs 17096 1 (autoclean)
nls_iso8859-1 2024 1 (autoclean)
nls_cp437 3548 1 (autoclean)
vfat 11392 1 (autoclean)
ide-cd 21080 1
cdrom 12060 0 [ide-cd]
awe_wave 155560 1
sb 31272 1
uart401 5628 1 [sb]
sound 55200 0 [awe_wave sb uart401]
soundlow 240 0 [sound]
soundcore 2208 7 [sb sound]

[X.]
I'm reason this patch is no best way, but he help to me.

--- linux-2.2.5/drivers/block/ide-cd.c.orig Sat Apr 10 16:50:18 1999
+++ linux-2.2.5/drivers/block/ide-cd.c Sat Apr 10 18:11:14 1999
@@ -3006,6 +3006,7 @@
else if (!strcmp(drive->id->model, "SAMSUNG CD-ROM SCR-2432"))
CDROM_CONFIG_FLAGS (drive)->limit_nframes = 1;
else if (!strcmp (drive->id->model, "GCD-R580B"))
+ if (!drive->using_dma)
CDROM_CONFIG_FLAGS (drive)->limit_nframes = 1;
/* 124/SECTORS_PER_FRAME; ? */
}

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