Red Hat Bugzilla – Bug 64684
grub does not respond to USB keyboard
Last modified: 2007-04-18 12:42:30 EDT
From Bugzilla Helper: User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; Q312461) Description of problem: If you have just a USB keyboard and attempting to do a multi-boot. GRUB does not respond. Once GRUB loads everything is fine. LILO responds to USB keyboard. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Multi-boot with GRUB on USB-only keyboard 2. Hit keys while booting 3. GRUB does not respond Additional info: This has been discussed on the grub lists and a patch has been proposed. Since grub is the default loader and USB-only systems are becoming more and more common. When this patch gets commited (and there is a grub release of it) you should pick this up as an Errata. See the following URL: http://mail.gnu.org/pipermail/bug-grub/2002-May/007203.html dpates@dsdk12.net (Derrik Pates) wrote: > Until you press at least one key on its internal keyboard, the keyboard > plugged in via the USB port does nothing. However, if you've pressed > anything on the USB keyboard, as soon as something's pressed on the > internal keyboard, the buffer contents come spewing out. I think I > mentioned in the original message that a USB-attached keyboard wouldn't > see any response from GRUB until a key on the internal keyboard got > pressed. Could you try the patch I have attached here to the enable/disable GateA20 function? It's not a complete patch (i.e. don't check it into CVS yet!), but in my investigation this fixes the initial problems I was seeing and I'm curious if it takes care of your problem too. Apply it to the CVS tree in the "stage2" directory, then build/rebuild and it should work... -----------------(patch for "asm.S" and "shared.h")------------------- diff -u -r1.85 shared.h --- shared.h 25 Mar 2002 21:43:55 -0000 1.85 +++ shared.h 7 May 2002 18:34:23 -0000 @@ -258,14 +258,18 @@ #define VARIABLE(x) ENTRY(x) +/* Keyboard controller defines */ #define K_RDWR 0x60 /* keyboard data & cmds (read/write) */ -#define K_STATUS 0x64 /* keyboard status */ +#define K_STATUS 0x64 /* keyboard status (read-only) */ #define K_CMD 0x64 /* keybd ctlr command (write-only) */ #define K_OBUF_FUL 0x01 /* output buffer full */ #define K_IBUF_FUL 0x02 /* input buffer full */ -#define KC_CMD_WIN 0xd0 /* read output port */ +#define KC_CMD_KBDIS 0xad /* disable keyboard */ +#define KC_CMD_KBEN 0xae /* enable keyboard */ + +#define KC_CMD_ROUT 0xd0 /* read output port */ #define KC_CMD_WOUT 0xd1 /* write output port */ #define KB_OUTPUT_MASK 0xdd /* enable output buffer full interrupt enable data line diff -u -r1.59 asm.S --- asm.S 12 Nov 2001 06:57:29 -0000 1.59 +++ asm.S 7 May 2002 18:34:28 -0000 @@ -1694,10 +1694,24 @@ */ ENTRY(gateA20) + pushl %ebp + movl %esp, %ebp pushl %eax + pushl %ebx call gloop1 + /* mask PS/2 interrupts */ + movb $0x10, %al + outb $0xa1 + movb $1, %al + outb $0x21 + /* disable keyboard */ + movb $KC_CMD_KBDIS, %al + outb $K_CMD + call gloop1 + + /* set up to write keyboard controller "output port" */ movb $KC_CMD_WOUT, %al outb $K_CMD @@ -1707,16 +1721,29 @@ jnz gloopint1 movb $KB_OUTPUT_MASK, %al - cmpb $0, 0x8(%esp) + cmpb $0, 0x8(%ebp) jz gdoit orb $KB_A20_ENABLE, %al gdoit: + /* write keyboard controller "output port" */ outb $K_RDWR call gloop1 + /* enable keyboard again (this also adds a bit of delay...) */ + movb $KC_CMD_KBEN, %al + outb $K_CMD + call gloop1 + /* unmask PS/2 interrupts */ + movb $0, %al + outb $0xa1 + movb $0, %al + outb $0x21 + + popl %ebx popl %eax + popl %ebp ret gloop1: ---------------------------------------------------------------------- -- Erich Stefan Boleyn <erich@uruk.org> http://www.uruk.org/ "Reality is truly stranger than fiction; Probably why fiction is so popular"
Already tracking the discussion :) Once Erich has a more final patch, I'll probably snag it and build a test package to put on people
*** Bug 55246 has been marked as a duplicate of this bug. ***
grub 0.93 has changes to fix the A20 gate handling. Packages are available in rawhide and at http://people.redhat.com/~katzj/grub/
This bug exists in the AS 2.1 stream and needs to be fixed as some of our customers are still at this level. We have test information to verify that the version that ships with RHEL AS 2.1 (Grub 0.90) and has the problem. When using Grub 0.93, which ships with RHEL AS 3.0, on an AS2.1 load, the problem is resolved. Can the customer use Grub.93 with AS2.1 ? Can Red Hat upgrade the version of grub which ships with AS 2.1 ? Do you need a seperate bugzilla to address this requirement ? - Samuel Benjamin (IBM). Problem Description : Installed Red Hat 2.1 AS on x445 with RSA II-EXA option installed. When using Grub .90, which ships with Red Hat 2.1 and there is no erratta listed for grub, I was unable to select the kernel in grub that I wanted to boot to. I installed RH 3.0 EL AS on the same system and with Grub .93, you can scroll thru the list and check each kernel. It appears that this is a limitation of the version of Grub that is in Red Hat 2.1. I thought about trying to install the Grub from Red Hat 3.0 EL AS and found that it has dependencies in the glibc rpm. Decided against taking the chance of crashing the OS since the kernel depends on glibc as well. Will speak to PE and see how we want to proceed. At this time, this appears to be a limitation of the revision of Grub that ships with Red Hat 2.1 AS.
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