EP93XX. ARM. ®. 9 Embedded Processor Family. EP93xx. User’s Guide 8×8 Key Mtx. ARMT. Maverick. 18 Bit Raster. LCD I/F. Crunch. Notes on making a proper EABI cross compiler for Maverick Crunch (EP, EP93xx) processors. This is a bit of “higher order hacking” and. It’s already configured to build in /opt/toolchains/ directory. This work is based on patches by Martin Guy and tested both on Cirrus demo board for the EP

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Chip house supports Linux on new ARM-based offering

Views Read Edit View history. The rich set of peripherals natively implemented by the microprocessor allow the module to drive all kind of buses commonly used in the industrial and PC worlds: A new Pop MV registers instruction needs to be added to the table, along with changes to Sec 7. When the operand is positive zero, cfnegs and cfnegd write positive zero to the destination register, while the result should be negative zero. By enabling or disabling the EP’s peripheral interfaces, designers can also reduce development costs and accelerate time to market by creating a single platform that can be modified to deliver differentiated end-products.

Unfortunately these never worked well enough for it to be usable. Disabling the rest would only leave multiply and compare, so we live with the imprecision. Enhance your users’ audio experience through Cirrus Logic’s hardware and software solutions: Do not depend on the sign extension to occur; that is, ignore the upper word in any calculations involving data loaded using these instructions.


It disables all bit integer operations which appear to have more unidentified hardware bugs, as shown by the openssl testsuite. There is a long description of it at http: The value appearing in the target register will still be correct.

Making fast floating point math work on the Cirrus MaverickCrunch floating point unit

In the case of a load, only the lower 32 bits the first word will be loaded into the target register. Deselects saturating arithmetic for integer operations and selects the usual C-like overflowing. Most crucially, it fails to take proper account of the way that the FPU sets the condition code registers after a comparison, so the code it generates sometimes gets floating point and bit integer comparisons wrong as well as failing to account for several of the hardware bugs.

Mainline GCC support has never worked for it but there is a modified compiler available that does and that is able to generate Crunch-accelerated Debian packages.

Code to enable forwarding under Linux with Maverick support enabled in the kernel, the effect is limited to the process that does this: These include all of the following: This could already be handled by faking a 63 bit truncation and using a splitter to expand those into something like this I only know integer ARM assembly, so I’m making this up: Disable interrupts when executing cfldr32 or cfmv64lr instructions.

The default is non-forwarding. Hosting provided by Metropolitan Area Network Darmstadt. Migrating to Zefeer Embedded Linux Kit 1. Software and Tools Software and Design Resources available by request.


The Cirrus crunch softfloat library has integer asm code to check for denorm values before these operations e.

Summary of bugs CMP: The coprocessor has 16 bit registers which can be used for or bit integer and floating point operations and its floating point format is based on the IEEE standard. EPx Audio Optional Display: The result is that the lower 32 bits of the result stored to memory will be correct, but the upper the 32 bits will be wrong. Zefeer specific integration guidelines.

As you can see in Sec mavegick. GCC does not emit conditional Maverick instructions. Evaluation Board Electrical Schematics. The processor must be operating in serialized mode.

crosstool-ng for the Maverick Crunch processors

Maverck also has four bit registers on which can perform a bit multiply-and-accumulate instruction and a status register, as well as conversions between integer and floating point values and instructions to move data between itself and the ARM registers or memory. Instruction set It provides instructions to add, subtract, multiply, compare, negate and give absolute value for all these types, to shift the registers in the two integer modes, and to convert between the data types.

This error will occur under the following conditions: Let the first instruction be a serialized instruction that does not execute.

The ARMT core operates from a 1.

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