Adds documentation for Freescale's QorIQ based cache-sram as under:- * How to enable it from a low level driver * How to set its size
Signed-off-by: Vivek Mahajan <vivek.maha...@freescale.com> --- Documentation/powerpc/fsl_85xx_cache_sram.txt | 31 +++++++++++++++++++++++++ 1 files changed, 31 insertions(+), 0 deletions(-) create mode 100644 Documentation/powerpc/fsl_85xx_cache_sram.txt diff --git a/Documentation/powerpc/fsl_85xx_cache_sram.txt b/Documentation/powerpc/fsl_85xx_cache_sram.txt new file mode 100644 index 0000000..628607d --- /dev/null +++ b/Documentation/powerpc/fsl_85xx_cache_sram.txt @@ -0,0 +1,31 @@ +* Freescale QorIQ based Cache SRAM + +Freescale's QorIQ platforms provide an option of configuring +a part of (or full) cache memory as SRAM. Any low level +driver can use its APIs via selecting FSL_85XX_CACHE_SRAM as +under for the case of gianfar ethernet driver:- + +In drivers/net/Kconfig:- + +config GIANFAR + .... + select FSL_85XX_CACHE_SRAM if MPC85xx + .... + +FSL_85XX_CACHE_SRAM and its base address are defined in +arch/powerpc/sysdev/Kconfig as under:- + +config FSL_85XX_CACHE_SRAM + bool + select PPC_LIB_RHEAP + +config FSL_85XX_CACHE_SRAM_BASE + hex + depends on FSL_85XX_CACHE_SRAM + default "0xfff00000" + +The size of the above cache SRAM memory window is passed via the +kernel command line as <cache-sram-size=....> + +Absence of the above parameter in the kernel command line is +treated as no cache SRAM. -- 1.5.6.5 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
