Remove OpenBIOS ESP patch. Merged upstream.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2108 c046a42c-6fe2-441c-8c8c-71466251a162

pc-bios/openbios-esp.diff

-The ESP SCSI driver currently doesn't check whether a DMA requests has 
-completed before checking its status. On older qemu versions this works ok 
-because DMA happens instantly. On never qemu DMA can take an indeterminate 
-amount of time ooto complete, just like on real hardware.
-
-The patch below waits for the controller to raise the DMA interrupt after 
-initiating a DMA request.
-
-Index: drivers/esp.c
-===================================================================
---- drivers/esp.c	(revision 61)
-+++ drivers/esp.c	(working copy)
-@@ -113,6 +113,8 @@ do_command(esp_private_t *esp, sd_privat
-     esp->espdma.regs->cond_reg = 0;
-     // Set ATN, issue command
-     esp->ll->regs[ESP_CMD] = ESP_CMD_SELA | ESP_CMD_DMA;
-+    // Wait for DMA to complete
-+    while ((esp->espdma.regs->cond_reg & DMA_HNDL_INTR) == 0) /* no-op */;
-     // Check status
-     status = esp->ll->regs[ESP_STATUS];
- 
-@@ -129,6 +131,8 @@ do_command(esp_private_t *esp, sd_privat
-     esp->espdma.regs->cond_reg = DMA_ST_WRITE;
-     // Transfer
-     esp->ll->regs[ESP_CMD] = ESP_CMD_TI | ESP_CMD_DMA;
-+    // Wait for DMA to complete
-+    while ((esp->espdma.regs->cond_reg & DMA_HNDL_INTR) == 0) /* no-op */;
-     // Check status
-     status = esp->ll->regs[ESP_STATUS];
-