Ati Radeon Hd 5770 Mac Os X Driver

I am owner of an 'old' Mac Pro, Model MD 770, bought in Nov. 2013 and equipped with an ATI HD 5770, 1 GB Graphics Card. 2 days ago my 'Eizo' Color Edge CG 276 Screen, probably bought 3-4 years ago.

EDIT: updated 5770 EFI - should work now. EDIT2: updated for the 6870/6850 Preamble: this is for Mac Pros only. There's not point to flash a card on a hack. Too many people here flash their PC cards with BIOS that were originally designed for other models. This can cause wonky fan behavior or worse.

It's better to make your own ROM, that is, your card's original BIOS + Apple's EFI (ideally, EBC for compatibility with old Mac Pros). This post shows how to do it. Notice: the 6870/6850 ROMs are designed for 64-bit EFI Mac Pros (e.g. Work in progress (by Netkas), so be warned. Before you start, It's always safer to enable file and screen sharing on you Mac Pro (system prefs/sharing).

Make sure OS X is up to date. Back up the card's BIOS: 1a. Create a DOS volume with disk utility (it can be added to an existing partition), put the latest version of ATIflash (techpowerup.com) in the volume.

Burn a FreeDOS boot CD. Download the iso () and burn the image with disk utility. Save the BIOS. Shut down and insert your PC card, remove all other radeon cards (for safety). Boot the Mac on the CD (hold C key).

No need to install DOS (enter 1 at the first prompt, then 2 at the 2nd prompt). Just navigate to your ATIFlash folder (no time to explain DOS commands here). To save your BIOS on the DOS volume, type. Blocknum=`printf%d ' `dd if=myrom.rom bs=1 skip=2 count=1 2>/dev/null `'` size=$(($blocknum * 512)) dd if=6850.efi.rom of=myrom.rom bs=$size seek=1 conv=notrunc Then hit return. If you have a 6870/6850, jump to step 4. Then check if the ROM could hold the EFI. Open myrom it in text edit and search 'mcuc'.

If 2 instances are found, go to step 4. If only one is found, you need to. Move the mcuc section (last part of the BIOS) to make room for the EFI. At this stage you can trash the modified myrom.rom that only has one 'MCuC'.

Open the original myrom in. Scroll down to the end, it should show a long string of 'F'.

Select a large part of it. Look for 'mcuc' (text search field) and locate the 2nd instance, near the end of ROM. Note its offset, as indicated at the bottom of the window. It should be 1A000 (hex). You can switch between decimal and hexadecimal by double clicking on the 'dec' or 'hex' text on the bottom left. Upward 'mcuc' is a long string of 'F' where the EFI should be inserted.

Put the cursor anywhere in that string. Switch to insert mode ('edit' menu) and paste. Note the new offset of 'mcuc'. If the offset hasn't changed, or if you have lost the 2nd instance of mcuc, close the ROM without saving and do these steps again. Save a copy of myrom.rom (with this name) in your home directory. Then redo steps 2a and 2b. If only one instance of mcuc found, you're screwed.

You cannot make a custom ROM with your original BIOS. If 2 instances are found. Correct the new offset of mcuc in myrom. Say it has changed from 1A000 to 1A200 (if you have pasted a 512-Byte string of Fs). In 3 Bytes, this new offset is written 01 A2 00. In BIOS code, bytes are written backwards: 00 A2 01. To find where to indicate this offset, locate the first instance of mcuc.

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8 Bytes upward (16 chars) you should see the original offset 00 A0 01. Go to overwrite mode and replace this with the new offset. Save myrom.rom in your home directory. Fix last oprom indicator (specifies that the BIOS is no longer the only element in the ROM) and checksum.

To do it, paste the following in the terminal and hit return. I see that you didn't have to move the mcuc.

Everything seems fine with your ROM. Plus, I don't think a bad flash could cause kernel panics. More likely, your card won't work at all. Maybe OS X doesn't like this model of card.

After restoring to M57703.rom it works fine. Damn!:-( Here is my experience with this rom: 7300GT: Boot normally, works in safe mode (my 7300 is broken, so will not work with a proper 10.6.5 boot or Wind0ze) 5770 slot 2 + 7300 slot 1: Mac OSX Kernel panic, boot to FreeDOS works but with no graphics (I had to reflash blind, atiflash 0 m57703.rom -f -reboot worked.) 5770 slot 1: Mac OSX no response (probably blind kernel panic, can't confirm as obvious no EFI boot but seems the case, see above.) boot to CD or Wind0ze results in infinite blinking cursor, meaning it is not possible to reflash with just the 5770. However, I woud still like to thank you for taking the time to make this. I had wished someone would, and I hope my case is the exception, not the rule. If you would like to flash with this guide, just make sure you have another Mac graphics card at hand just in case it goes horribly wrong!